Multiple reports have emerged about a Mark Kennedy (AKA: Mark Stone, "Flash"), an informant based out of the UK who had links in the United States. A post on the Denver Anarchist Black Cross's website gives a good summary:
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.
Any american or kanadian who knows that they had contact with him please make known the times and initiatives that he may have attended.
More information will be made public as it’s compiled…
A report from UK Indymedia details more of his activities (another photo here). There are also reports he was working on organizing against the upcoming G8 summit in France. He claims he had a brother in Cincinnati. He had been a trusted member of radical communities and social movements for a decade and his ties were far, including possible relationships with Tarnac folks. There are claims that he has been confronted and admitted this information. Anyone with more information on Mark should email SnitchWire.