The shot that changed German politics in 1967 was fired by an East German Stasi spy:
The killing in 1967 of an unarmed demonstrator by a police officer in West Berlin set off a left-wing protest movement and put conservative West Germany on course to evolve into the progressive country it has become today…
It is as if the shooting deaths of four students at Kent State University by the Ohio National Guard had been committed by an undercover K.G.B. officer, though the reverberations in Germany seemed to have run deeper.
Spy Fired Shot That Changed West Germany
(Thanks, Bill