Funkspiel
Funkspiel (German:radio play) was the name of a Counterintelligence operation carried out by Nazi Intelligence during Second World War. Captured Radio Operators in France were to forcibly send false messages to British Intelligence.
It allowed Nazi Intelligence to intercept Allied Military Information, convey Disinformation to the enemy and actively fight Resistance movements. By doing so Nazi Intelligence made the pretence of being the French resistance with a script written for the enemy by the Gestapo or the Abwehr.