Mark Kennedy (born 7 July 1969), undercover names Mark Stone and Mark Flash, is a former London Metropolitan Police officer who, whilst attached to the police service's National Public Order Intelligence Unit, (NPOIU) infiltrated many protest groups between 2003 and 2010 before he was unmasked by political activists as an undercover policeman on 21 October 2010 and his identity was confirmed by the media outlet three days later.
