Licensed to kill…discourse? agents provocateurs and a purposive right to freedom of expression

Undercover police operations have emerged from the shadows and into the spotlight in the United Kingdom as a result of a public inquiry into undercover policing and the enactment of the Covert Human Intelligence Sources (Criminal Conduct) Act. The inquiry has revealed troubling details about the ways intelligence and police services have wielded their powers to infiltrate and undermine political groups and social movements over the course of five decades. The problem is not exclusive to the United Kingdom, but is seen the world over. Yet despite the widescale nature of the problem, the legality of agents provocateurs – undercover officers who infiltrate social and political movements to manipulate their messaging, instigate violent tactics and undermine public perception – has received scant attention in legal scholarship or the jurisprudence of the European Court of Human Rights. This article capitalises on the current spotlight to suggest that agents provocateurs can and should be conceived of as (potential) violations of the right to freedom of expression under the European Convention on Human Rights. A purposive approach is required to ensure protection for not only the means of expression – the exchange of information and ideas – but also the ends – vibrant democratic discourse and meaningful public debate.


INTRODUCTION
The second is the enactment, in March 2021, of the Covert Human Intelligence Sources (Criminal Conduct) Act 2021 (CHIS Act or Act). 7 In the face of public outcry over the propriety of covert operationsand a pending appeal over their legalitythe Act authorises 'covert human intelligence sources' to commit unspecified crimes in the course of their operations where necessary in the interests of national security, to prevent or detect crime or disorder, or in the interests of the 'economic well-being' of the UK. 8 Prior to its passage, the British government assured Parliamentarians, and the public, that the CHIS Bill (as it then was) complied with the European Convention on Human Rights (ECHR or Convention), including prohibitions on the unjustified use of force and torture, fair trial rights, and respect for private and family life. 9 However, the use of covert agents may infringe other ECHR-protected rightsincluding freedom of expression and assemblyand affect broader democratic interests where such undercover agents go from sourcing information to creating or manipulating it; from surveilling individuals to prevent future law-breaking to actively encouraging it. 10 The legality of such operations from a human rights perspective has received scant attention by British Parliamentarians 11 or legal scholars, 12 and has yet to be considered by the European Court of Human Rights (ECtHR or Court).
This article explores this novel terrain to shine a spotlight on the use of agents provocateurs as a potential violation of freedom of expression under Article 10 of the ECHR. 13 The use of covert agents may contravene freedom of expression where the agents intentionally turn movements violent as pretext to suppress them: in doing so, they have impermissibly interfered with the means of expression (the exchange of information and ideas) as well as the ends (vibrant public debate and meaningful democratic discourse). More challenging cases arise where undercover 28 April 2021; Rob Evans and Vikram Dodd, 'Stephen Lawrence case: Theresa May orders inquiry into police spies' (The Guardian, 6 March 2014) <https://www.theguardian.com/uk-news/2014/mar/06/stephen-lawrence-theresa-mayinquiry-police> accessed 28 April 2021. 7. Covert Human Intelligence Sources (Criminal Conduct) Act, 2021 c. 4. An additional pressure point for the government concerns the pending appeal before the Court of Appeal concerning the so-called 'Third Direction' judgment of the Investigatory Powers Tribunal, which assessed the legality of such operations: (2019) UKIPTrib IPT_18_186_CH. 8. CHIS Act (n 7) ss 1(5)(5) and (6 . ECHR Memorandum (n 9) 12-29. Indeed, the memorandum refers only to Articles 2, 3, 5, 6 and 8, as well as Article 1 of Protocol 1, of the ECHR; the right to freedom of expression in Article 10 is not mentioned. 12. By contrast, sociologists have been examining the impacts of undercover police officers on activist groups for decades: see eg Marx (n 1); Raphael Schlembach, 'Undercover policing and the spectre of "domestic extremism": the covert surveillance of environmental activism in Britain' (2018) 17(5) Social Movement Studies 491; Nathan Stephens Griffin, '"Everyone was questioning everything": understanding the derailing impact of undercover policing on the lives of UK environmentalists' (2020) Social Movement Studies 459. 13. Of course, agents provocateurs may also impact ancillary rights, including Articles 8 (privacy), 11 (freedom of assembly and association) and 13 (right to an effective remedy) ECHR. An in-depth look at these provisions falls outside the scope of this article. However, the analysis urged here may apply with equal force to allegations under Article 11, as the Court has held that 'the protection of personal opinions, secured by Article 10, is one of the objectives of freedom of peaceful assembly as enshrined in Article 11' (see Ezelin v France App no 11800/85 (ECHR 26 April 1991) [37]). agents merely infiltrate protest groups and alter or interfere with the formulation and delivery of their messaging. The precise dividing line where States can operate in the 'marketplace of ideas' 14through covert operations to foil terrorist plots, keep guns off the street, root out corruptionand where they violate rights is a difficult contextual exercise. The object of this article is to take a first step in this analysis to distill the principles at play when States intentionally manipulate the speech of private actors engaged in protest. Though agents provocateurs may interfere with freedom of expression in myriad ways, the focus of this article is on the most acute, rights infringing cases: those that infiltrate protest groups and incite violence and criminality. Greater scrutiny is required in light of such agents' capacity to alter public discourse, quell dissent and undermine efforts for peaceful reformthe hallmarks of democracy.
The first section of this article provides examples of the phenomena in Council of Europe Member Statesincluding the UK, Italy, Ireland, Germany, France and Ukraineas well as across the Atlantic in Canada and the United States. This serves to illustrate the scale and complexity of the problem, as well as the variance in the forms and severity of the interference involved. The second section analyses the relevant (albeit limited) jurisprudence of the ECtHR on agents provocateurs, including a brief overview of the Court's approach to such agents in relation to criminal proceedings, and the footholds in its Article 10 case law which provide guidance on how the Court might characterise the nature of the interference on freedom of expression. The third section sets out how the Court ought to approach the proportionality analysis in such cases under Article 10(2) ECHR in the event they come before it, focusing on instances where agents provocateurs push protest movements towards violence to justify State suppression. The conclusion reflects on the issues raised and suggests areas of further study and reflection.

SPIES, DAMNED SPIES, AND STATISTICS 15
Despite operating largely in the shadows, the use ofand reliance onundercover agents by governments is no secret. Indeed, governments around the world openly admit their use of undercover agents to root out corruption, foil terrorist plots, and prevent drugs and guns from reaching the street. 16 Moreover, some countries have legislated in and around the use of counterintelligence operations, including the extent to which undercover agents may move from passive informants to active participants in criminal activities. 17 This is the focus of the CHIS Act, discussed above. In such instances, the intention behind the use of such covert operations and their necessity in a democratic society are less controversial, though issues may still arise in relation to ensuing criminal proceedings. However, what of undercover agents who instigate violent tactics with the intention to curb criticism or provide pretext for State suppression of protest movements?
The secrecy inherent in these operations means one cannot point to statistics of when and how often such agents are used, let alone the extent of the means employed. Moreover, since the issue of agents provocateurs is primarily litigated when (individual) defendants invoke the defence of entrapment, States can avoid embarrassing findings by withdrawing criminal charges before adverse judgments have been handed down. This is all the more reason for recognising the human rights angle urged in this article: if the victims of these tactics could contest their use as a violation of freedom of expressionor ancillary rightsit would help to drive this harmful practice from the shadows and address the broader impacts of this technique on public discourse and democratic progress. Agents provocateurs tread on crucial rights to freedom of expression (as well as others such as privacy, assembly and the right to a remedy) and raise a critical question: how much trust are we willing to place in governments to respect our right to criticise, question and protest their (in)actions, where they act in secret and under the cover of (legislated) legitimacy? The question is a live one in light of troubling incidents in Council of Europe Member States, the United States and Canada. Several examples illustrate the nature and nuance of the problem.

EUROPE
In perhaps the most notorious (and far-reaching) case, British police constable (PC) Mark Kennedy was exposed as an undercover agent provocateur operating in environmentalist, anti-capitalist and anti-fascist movements across Europe. 18 In 2009, more than one hundred environmental activists were arrested in a 'pre-emptive strike' against their alleged plot to take over a power station in the UK. 19 Twenty activists were convicted of conspiracy to commit aggravated trespass. 20 However, the case against a further six activists subsequently imploded when it was revealed that PC Kennedy had played a 'central role in organising and paying for the invasion'. 21 In response to defence requests for disclosure of classified documents about PC Kennedy's role in organising and funding the protest, prosecutors abandoned the criminal charges. 22 PC Kennedy is also alleged to have acted as an agent provocateur beyond the island's shores in protest movements in Ireland, Germany, Italy and Spain. 23 25 In Germany, PC Kennedy allegedly worked as an agent provocateur within anti-fascist groups to 'instigate actions together with them' 26 and in anti-capitalist protests opposing G8 and G20 summits. 27 He was alleged to be working with the German police. 28 Though the German government refused to answer parliamentary questions put forward by a German MP concerning PC Kennedy's role, 29 it subsequently asked that the Undercover Policing Inquiry be extended to include covert operations by British agents in Germany. 30 PC Kennedy was allegedly a member of the 'National Public Order Intelligence Unit' tasked with 'monitor[ing] so-called domestic extremists', 31 but the foregoing (publicised) instances suggest he went well beyond infiltration and collection-gathering. Similar allegations have come to light over the UK's (formerly secret) Special Demonstration Squad (SDS), and the manipulation of protest groups' formulation and delivery of their messaging. These cases illustrate the potential impacts of agents provocateurs on freedom of expression, even where they do not resort to violence or instigate criminal acts. Undercover police officerand member of the SDS -Bob Lambert infiltrated an environmentalist group and co-wrote an anti-McDonald's pamphlet at the centre of a defamation case which made its way to the ECtHR, nearly bankrupting his victim in the process. 32 Another SDS member, Rick Gibson, worked his way up the ranks to become Joint National Secretary of the 'Troops Out Movement'an organisation calling for the demilitarisation of control of the British government outside its borders (raising an extraterritorial jurisdiction question). This is not addressed in this article but warrants further study and attention. Northern Ireland. 33 His senior position afforded him the potential to 'influence the direction of the movement as a whole'. 34 British agents provocateurs have also gone digital: WikiLeaks documents revealed the use of covert agents to infiltrate online communities (including online protesters), influence their communications and sow dissension to 'control, infiltrate, manipulate, and warp online discourse'. 35 The purpose of such 'online covert ops' is starkly stated: using 'online techniques to make something happen in the real or cyber world'. 36 No doubt additional cases will come to light during the Inquiry, which continues to hear evidence. But this is hardly a problem unique to the UK: to the contrary, agents provocateurs operate in democracies (and backsliding democracies) elsewhere in Europe. In a 2008 interview with Quotidiano Nazionale, Francesco Cossigaformer President and head of Italy's secret servicesadmitted to using agents provocateurs during his tenure and urged his successor to infiltrate ongoing protest movements of teachers and students 'with agents provocateurs ready to do anything'. 37 His stated aim was to turn public sentiment against the movement and provide pretext to violently suppress students demonstrating against governmental budget cuts to education. 38 In his words, agents provocateurs helped 'extinguish the flame before the fire spreads'. 39 Similar allegations have arisen in neighbouring France over so-called 'casseurs' or 'organised thugs'. During workers' protests in Paris in 1979, a scandal erupted when an undercover police officer named Gérard Le Xuan was apprehended while breaking a storefront window. A representative of the trade union noted that such actionsby Le Xuan and others acting as agents provocateurssought to 'distort' the purpose of the protest 'by relegating to the background the social and human tragedy which targets the steel workers and their families'. 40  discrediting the movement'. 41 The police denied the claims, insisting that plain-clothes officers merely collected information on the march's movements, as is standard practice. 42 In Ukraine, there's even a name for pro-government agents provocateurs -'titushky'though their roles and the extent of their interference remain far from clear. 43 During the so-called 'Euromaidan' movement nearly a decade ago, Ukrainian authorities were alleged to have used agents provocateurs in the form of 'paid instigators who infiltrate the protests and then start attacking the police to provoke a "retaliatory" suppression of the "violent protesters"'. 44 In another instance, the Security Service arrested a police officer and acknowledged that he was 'among other agents provocateurs who carried out a criminal scenario and were trying to disrupt the Verkhovna Rada [Parliament] meeting and destabilize the situation in the capital'. 45 The officer was said to have used a slingshot to shoot screws at journalists, protesters and police. 46

NORTH AMERICA
Across the Atlantic, agents provocateurs have been alleged to incite or engage in violence during protests, and to infiltrate activist networks with the intention of pushing them in the direction of violence.
In Canada, undercover police officers (wielding rocks) infiltrated a peaceful protest during a North American leaders' summit in Quebec in 2007. 47 The peaceful protesters identified the officers as agents provocateurs, and demanded they put down their rocks and leave the demonstration. 48 Faced with damning video evidence of the events, the police force admitted that officers had infiltrated the protest, but denied they were there to provoke the crowd or instigate violence. 49 41. Liselotte Mas, 'Analysis of a rumour: Did undercover police try to discredit the "Yellow Vests"?' (The Observers, 4 In the United States, a senator testified before a Commission of Inquiry that in his experience prosecuting labour activists, government spies would infiltrate trade unions and 'try to get decent union men to commit some crime'. 50 More recently, allegations circulated that undercover police officers were responsible for instigating violence and damaging property during Black Lives Matter protests across the country. 51

THE NATURE AND SCALE OF THE PROBLEM
These examplesfrom Europe and North Americaillustrate the insidiousness of the problem, and the dangers of State interference with the formulation, content and expression of activists' and dissidents' messaging. They also demonstrate the varied nature of the interference: in some cases, agents provocateurs attended protests and sought to incite violence in order to justify State suppression; in others, undercover police officers played the 'long con', infiltrating activist groups and rising through the ranks, affording them the opportunity to exert control over the groups' direction and messaging. While the focus of this article, and the Article 10 ECHR analysis to follow, is on the first categorythose agents provocateurs who cause an offence to be committedthe latter category of infiltration, control and manipulation of the movement and messaging merits further consideration.
A final note on these case studies is warranted. Though some State officials admitted the use of agents provocateurs in activist networks, as in Italy and the US, the majority remain alleged cases for which the respective States have not had to answer. The secrecy inherent in these operations means that they are often easily dismissed by governments and police forces as 'fake news' or sidestepped through the withdrawal of criminal charges against activists to avoid disclosure. Determining whether such operations comply with States' human rights obligations is not a task which should be left to governments alone: to the contrary, judicial oversight is greatly needed to ensure that appropriate safeguards are in place.
The next section examines how the ECtHR has addressed cases of agents provocateurs in the context of incitement cases under Article 6, before describing how the Court can and should conceive of this form of government interference with freedom of expression. While the ensuing analysis only applies to High Contracting Parties under the ECHRand therefore excludes the North American examples provided abovesimilar obligations arise under Article 19 of the International Covenant on Civil and Political Rights. Accordingly, the UN Human Rights Committee may take a similar position on the matter were such a communication to come before it.

AGENTS PROVOCATEURS UNDER THE ECHR: FOOTHOLDS IN THE JURISPRUDENCE
To date, the ECtHR has only considered agents provocateurs under Article 6 of the ECHR, in relation to undercover investigative techniques and the fairness of ensuing criminal proceedings. 52 This case law has focused at an individual levelnamely, whether a defendant was incited to commit a criminal offence by an undercover officer, and what use can be made of any evidence obtained in securing a conviction. 53 Moreover, the cases have largely arisen in the context of covert operations targeting serious crimessuspected drug trafficking, corruption and terrorism. 54 While these are admittedly very different circumstances, there are several takeaways from the Court's analysis which are noteworthy for present purposes. The first is the Court's definition of incitement: Police incitement occurs where the officers involvedwhether members of the security forces or persons acting on their instructionsdo not confine themselves to investigating criminal activity in an essentially passive manner, but exert such an influence on the subject as to incite the commission of an offence that would otherwise not have been committed, in order to make it possible to establish the offence, that is, to provide evidence and institute a prosecution. 55 This definition is also applicable in the context of agents provocateurs operating in protest movements, where they move beyond 'essentially passive' investigations into inciting violence and criminality. As the Court has made clear in the Article 6 context, the authorities' intention is a critical component: in the incitement context, it is to cause an offence to be committed in order to lay criminal charges; in the protest context, the intention may be to undermine the group itself, alter the formulation and/or delivery of its message, or provide pretext for State suppression.
Second, although the Court has accepted the use of undercover agents as a 'legitimate investigative technique for investigating serious crimes,' it has required that 'adequate safeguards against abuse be provided for, as the public interest cannot justify the use of evidence obtained as a result of police incitement'. 56 This includes a searching judicial inquiry where criminal charges are laid and evidence obtained in the course of such operations is put forward to secure a conviction. 57 Finally, the Court has repeatedly held that the burden of proof where incitement is alleged rests with the State. 58 This onus reflects the inequality of arms where 'operational information' is squarely within the knowledge of the State, and must be viewed in light of the trial court's obligation to 'take the necessary steps to uncover the truth'. 59 The Court has yet to consider whether the use of agents provocateurs may infringe freedom of expression under Article 10 where they are used to undermine protesters and activist movements critical of the State. However, there are several strands of the Court's jurisprudence which provide guidance on how it might characterise the use of agents provocateurs from the perspective of freedom of expression.
First, the Court has repeatedly emphasised the importance of freedom of expression as an essential foundation ofand basic condition fordemocratic progress. 60 As a result, there is little scope for restrictions of freedom of expression where they relate to either political speech or debate on matters of public interest. 61 Moreover, the limits of permissible criticism are wider in respect of the government than private citizens, as democratic systems must allow for close scrutiny of governments' actions or omissions and government restraint in seeking to limit or stifle such criticism is accordingly required. 62 Second, the Court has noted that interference in protests '[does] a disservice to democracy and often even endanger[s] it'. 63 Outright bans on protests or demonstrations are not permitted, absent a real risk that they will result in disorder which cannot be prevented by other (lesser) means. 64 In addition, the utmost caution is required where measures 'are such as to dissuade […] persons from imparting information or ideas contesting the established order of things'. 65 Care must always be taken to ensure that freedom of expression is not subject to the 'heckler's veto,' whereby limits are determined by the audience's response. 66 Such are the demands of democracy and pluralism.
Finally, the Court's pronouncements on States' positive obligations under Article 10 must be borne in mind. 67 When the ECHR was drafted, freedom of expression was seen as both 'a precious heritage as well as a dangerous instrument' in light of the 'powerful influence the modern media of expression exerted upon the minds of men'. 68 In the decades since, the ECtHR has rendered thousands of judgments on how governments control this 'dangerous instrument', by limiting or suppressing expression through censorship or other means. More recently, the Court has moved beyond censorship to consider the contours of States' positive obligations to facilitate expression through action or inaction, as the circumstances warrant. In particular, the Court has recognised that Article 10 does not merely impose negative obligations on High Contracting Parties to refrain from conduct which undermines the right; it also imposes certain positive obligations to ensure the 'genuine and effective exercise' of the right. 69 States are thus obliged to 'create a favourable environment for participation in public debate […] to enable the expression of ideas and opinions without fear'. 70 This is a critical shift, as States can cause just as much harm to public discourse and debate by infiltrating and undermining protest groups as by censoring or banning them.
How, then, should the Court approach the permissibility of agents provocateurslike those in the examples provided abovefrom the perspective of Article 10?

FROM THE SHADOWS TO THE COURTS: THE ANALYSIS UNDER ARTICLE 10
In order to establish a violation of Article 10, it must be established, first, that agents provocateurs constitute an interference with freedom of expression, and second, that the interference is not permissible under Article 10(2). An interference can only be justified under Article 10(2) where the State establishes three (cumulative) components: the interference was prescribed by law, pursued a legitimate aim, and was necessary in a democratic society. 71 Based on its jurisprudence in the context of agents provocateurs under Article 6 ECHR, the Court should find that agents provocateurs interfere with freedom of expression where they move beyond 'essentially passive' investigations to incite or encourage violence. 72 As a starting point, the Court has held that an interference with freedom of expression (or peaceful assembly) 'does not need to amount to an outright ban, legal or de facto, but can consist in various other measures taken by the authorities'. 73 Such 'other measures' include withholding information necessary for public debate 74 and withholding appointments of public officials who express critical views. 75 The use of agents provocateurs falls within these 'other measures' shy of an outright ban: where they turn protests violent as pretext to suppress them, they have effectively prohibited activists from expressing themselves and caused a chilling effect which undermines the groups' ability to formulate and deliver their message. 76 Indeed, the mere idea of police surveillance and infiltration within a political movement 'may lead to feelings of demoralization, helplessness, cynicism and immobilizing paranoia, and can serve to disintegrate a movement'. 77 In sum, there may be two components to the interference posed by agent provocateurs. First, agents provocateurs may interfere with the formulation and content of activists' expression. In the examples provided, agents provocateurs infiltrated and undermined protests by teachers and students, peaceful demonstrations over free trade, environmentalist networks across Europe, workers' rights organisations and protests for racial justice. In each case, the government sought to undermine the curation of expression and the value of the protesters' speechfrom planning and funding criminal trespass, to turning peaceful protests about free-trade and educational reform violent, to infiltrating trade unions and encouraging 'decent men' to commit crimes. 78 Far from allowing expression to flourish, agents provocateurs frustrate the processes that freedom of expression is meant to protect: individuals and groups in democratic society challenging the status quo, asking difficult questions, and promoting awareness of matters of public interest. In essence, they are attempting to enforce or engender silence and/or alter the narrative. 79 Significant scrutiny should be brought to bear on measures which dissuade the open and meaningful exchange of information and ideas, and if the Court were confronted with such a case, it ought to take a dim view of democratic governments intentionally thwarting lawful speech. 80 Second, agents provocateurs may interfere with the way the expression is received by the public, thereby lessening the quality of activists' expression. The perception of social movements is often tarnished when protests turn violent, as the discourse surrounding the Black Lives Matter protests in the US illuminated. As Professor Gary Marx noted, agents provocateurs 'can serve to stigmatize the movement as violent, alienate it from its potential constituency, and focus attention away from the basic issues'. 81 This is precisely the government's intentionin Cossiga's words, to turn popular consensus against the protesters, and 'extinguish the flame before the fire spreads'. 82 While less tangible than overt censorship, the use of agents provocateurs is contrary to the spirit and intent of Article 10 and the public's right to be 'properly informed'. 83 A State interferes with this right where it surreptitiously distorts and manipulates a protest movement's message, for Article 10 'protects not only the substance of the ideas and information expressed but also the form in which they were conveyed'. 84 With the interference established, the analysis turns to whether it can be justified under Article 10(2). As a starting point, States have a margin of appreciation to determine where limitations on expression may be necessary, because domestic authorities are better placed to make this determination. 85 However, this margin is narrower whereas herethe contents of the speech concern individual (political) expressions, the information is in the public interest, 86 and the object of the speech is (criticism of) the government. 87 Moreover, the nature of the restriction is the distortion of the formulation and contents of the expression and the suppression of protesters' rights to assembly and expressionoften by violent means. As a result, States are entitled to a narrow margin of appreciation with respect to the restriction.
The Court's jurisprudence suggests that, even where the use of agents provocateurs is prescribed by law (as the CHIS Act purports to do, for instance), it should fail at both the 'legitimate aim' and 'necessity in a democratic society' stages. The aim pursued by government infiltration of movements to turn them violent, undermine public perception, and justify State suppression can only be said to be the limitation of criticism and dissent, which is neither legitimate nor necessary for democratic society. Unlike censorship or banned protests, which may be permissible in some instances in the interests of national security or the prevention of disorder, 88 it is decidedly more difficult to conceive of legitimate aims for agents provocateurs in the case studies above, which aimed to provoke violence and stoke public disorder. Public authorities may use police and other means to monitor demonstrations and protect the peaceful assembly and expression of protesters. They may also undertake secret surveillance, or infiltrate movements to monitor their actions in certain circumstances. 89 However, the Court has recognised the need for safeguards as operations 'set up to protect national security may undermine or even destroy democracy under the cloak of defending it'. 90 Agents like those in the above-noted case studies cannot be said to be necessary in a democratic society. The circumstances must be borne in mind: the targets of these operations were environmentalists, advocates for racial justice, trade unions and anti-fascists. These were not operations akin to those which target criminal organisations or terrorist networks. The purpose was not merely 'passive' collection of information, but active efforts to affect the formulation and delivery of these movements' messagesand the way their messages were received by the publicby nudging them towards violence. The pre-emptive silencing of criticism and dissent in such circumstances cannot be said to meet a 'pressing social need'. Importantly, the necessity criterion is particularly rigorous where, as here, the interference is a form of prior censorship. 91 In any case, the means used must be proportionate to the aim pursued. 92 The Court has found a violation of Article 10 where police arrested and detained disruptive (but otherwise peaceful) protesters, on the basis that the protest 'could have been countered by less draconian measures'. 93 Similar reasoning applies here: even if the agents are pursuing the legitimate aim of preventing disorder or crime, surely there are more proportionate ways of doing so than instigating or inciting violence or criminality by activists. The Court's case law on secret surveillance and undercover operations, summarised previously, is particularly instructive in this regard: though such techniques may be used, they do not provide carte blanche for States, even in cases where the ends sought to be achieved might appear to justify the means States seek to employ.
Agents provocateurs also violate States' positive obligations with respect to freedom of expression. 94 The Court has recognised that Article 10 does not merely impose negative obligations on High Contracting Parties to refrain from conduct which undermines the rightit also imposes certain positive obligations to ensure the 'genuine and effective exercise' of the right. 95 As noted above, the positive obligation arising under Article 10 requires that States 'create a favourable environment for participation in public debate […] to enable the expression of ideas and opinions without fear'. 96 Far from fostering an environment for discourse to flourish, the agents provocateurs in the examples from Europe (and North America) sought, inter alia, to frustrate and distort, manipulate and mislead, stigmatise and suppressthereby undermining protesters' right to disseminate their message, and the public's right to receive it. In this sense, the use of agents provocateurs is government interference in a more insidious and surreptitious, but no less damaging, form than long-recognised violations such as censorship. 97 Two broader points which ought to inform the Court's analysis are warranted: the first concerns the individual repercussions for activists targeted by agents provocateurs, while the second relates to the 'chilling effect' on the activist group and movement. 98 First, the use of agents provocateurs may not only violate Article 10, but also limit individuals' rights to claim Convention protections. The Convention does not extend to protests where the organisers and protesters have 'violent intentions'. 99 As a result, where agents provocateurs succeed in turning protests violent, they have effectively stripped protesters of Convention protections. 100 This reveals the insidious and damaging nature of this form of interference, and its repercussions for activist groups and their individual members.
Second, existing remediesincluding entrapment defencesare no answer to the broader implications and chilling effects of agents provocateurs on political and social activism, and on democracy itself. While an individual may succeed in arguing for an acquittal on account of the interventions of an undercover agentor the State may decide to withdraw charges to avoid disclosure, as in the case of the British environmental activists referred to previouslythe long-term damage to the survival, work and reputation of the activist group is much harder to rectify. 101 The democratic project survives and thrives on all of the elements that make up peaceful protest: formulating ideas, expressing outrage, questioning and criticising majoritarian views and mainstream beliefs, 'speaking truth to power'. State efforts to frustrate or undermine these processes with agents provocateurs can and should be labelled violations of freedom of expression.

CONCLUSION
In his long-awaited report concerning the British government's investigatory powers, David Anderson QC surmised that the polarised nature of the debates surrounding government surveillance boils down to 'a question of trust'. 102 This description applies with equal force to agents provocateurs. But beyond the propriety of such techniques, or the trust society is willing to place in its government, the legality of agents provocateurs deserves greater attention and debate. This includes whether they constitute a violation of freedom of expression under Article 10 of the ECHR.
This article offered examples of (alleged and admitted) agents provocateurs operating in Europe and North America. Public inquiries and admissions by individuals involved suggest the significant scale of these operations, and their frequent targets: trade unions, environmental activists, anti-war protesters, advocates for racial justice. Existing footholds in the jurisprudence of the ECtHR framed the analysis of how such agents should be conceived. In particular, the Court has been clear that outright bans on protests or demonstrations are impermissible absent a real risk of disorder that less intrusive means cannot address. Similarly, the Court has viewed with significant scorn measures designed to dissuade individuals from speaking truth to power or challenging the status quo. The agents provocateurs in the examples provided sought to silence or suppress activists doing just that.
Freedom of expression demands not only that individuals be free to impart their information and ideas; it also enshrines the public's corresponding right to receive them. Agents provocateurs illustrate that governments can violate Article 10 when they set out to meddle in the 'marketplace of ideas' by impeding the process and contents of expression. 103 Freedom of expression is not only the right to speak, but the right to calibrate, craft and convey one's message free from undue government interference. A government that significantly alters how one is heard may violate the right to freedom of expression.
In the final section, the article suggested a line of analysis for whether such interference could be justified under Article 10(2). The margin of appreciation afforded to States should be narrowly circumscribed in light of the individual (political) contents of the targeted speech, the public interest of the information and ideas at issue, and the object of the speech (criticism of government). Though the analysis would turn on the facts and argument in the individual case, it is difficult to conceive that the Court would find that agents provocateurs meet the three-pronged requirements, particularly necessity in a democratic society.
The article also highlighted the potential afforded by the Court's jurisprudence concerning States' positive obligations in respect of expression. Limiting or suppressing communication through censorship is only one of the roles governments play in communicative processes, yet it has dominated academic scholarship and ECtHR jurisprudence. For the right to freedom of expression to be genuine and meaningful, States' conduct in facilitating and enabling expression must also be scrutinised. Further research and study in this areaincluding how it relates to infiltration, control and manipulation by State authorities of protest movements and their messaging, and the safeguards necessary to ensure protection of freedom of expressionis warranted.