Max Troll

Max Troll (1902 – 7 April 1972) was a German communist-turned-informer who betrayed hundreds of Bavarian communists to the Bavarian Political Police, a forerunner of the Gestapo, between 1933 and 1936. Troll spent a short time in Dachau concentration camp and served in the German Army during World War II. After the war he was sentenced to ten years in jail for his role as informer and released after five, in contrast to his Gestapo handlers who were not prosecuted.

Troll was never a Nazi, opposing the regime instead, but a number of factors have been cited for his betrayal, among them financial difficulties, his treatment while being held at Dachau and the threat of physical violence against his stepbrothers should he not cooperate. Provided by Wikipedia