Another name for
The London Mob.
Later adopted by a group of Situationist pranksters in the late sixties. In their most famous stunt a group of them dressed up as Father Christmas / Santa Claus before invading a department store where they proceeded to hand out the toys (free) to small children. This lead to the spectacle of security guards snatching toys off small children while the police dragged away Christmas] / Santa Claus.
Grant Morison 's invisibles character was inspired by his eponymous predecessors.