Mark Kennedy AKA Mark Stone, who lived in Nottingham, has been exposed as having worked as an undercover police officer and this has been confirmed by Nottingham Indymedia and endorsed by other activist groups.
From 2000 to at least the end of 2009, Mark Kennedy was a well-known face in the local activist community and was actively involved in various environmental, animal rights, anti-capitalist and anti-fascist groups and campaigns.
Investigations into his identity revealed evidence that he has been a police officer and a face-to-face confession has confirmed this. The people involved in confronting Mark and getting his confession from him make clear that for security reasons no more information can be made public at this stage.
Activist Security Advice: Infiltrators, Informers and Grasses how, why and what to do if your group is targeted (PDF) from activistsecurity.org | Informants, Infiltrators & Provocateurs from security.resist.ca
Related Infiltration Articles: Heathrow Protesters Uncover Spy Plot | Indymedia and British Intelligence Services | Police caught on tape trying to recruit protester as spy | Antifa Statement on Police Informant Matthew Gibbons | NZ: The beauty of hindsight - police informant caught after 10 years | Undercover policeman reveals how he infiltrated UK's violent activists | Observer exposes police spy in the Socialist Party