Cutting Edge: Confessions Of An Undercover Cop

Channel 4 documentary about policeman Mark Kennedy who assumed the identity of Mark Stone and posed as an environmental activist to go undercover and infiltrate protest groups, reporting their plans back to his handlers in the Policy Force (not only in the UK but in Europe as well).

How do you reconcile spying on people and betraying folk who had become your good friends with your conscience? Not stopping there, Mark led a double life in his personal relationships and became involved sexually with a fellow activist. Serious questions about morality and trust get raised here, not just with betrayal but ultimately with the questionable motives and justification of the police action.