Who are these people ....fruitcakes or agent provocateurs? - Anjem Choudary and his gang of merry masked men!

“Fruitcake is also used, especially in the United Kingdom and the United States, as insulting slang for a 'crazy person' (e.g. "he's a complete fruitcake"). It is derived from the expression "nutty as a fruitcake", which was first recorded in 1935.

An agent provocateur is a person who secretly disrupts a group's activities from within the group. Agents provocateur are typically representing the interests of another group, or are agents who are directly assigned to provoke unrest, violence, debate, or argument by or within a group while acting as a member of the group…. provocateurs deliberately carry out or seek to incite counter-productive and/or ineffective acts, in order to foster public disdain for the group and provide a pretext for aggression; and to worsen the punishments its members are liable for.” (Wikipedia)