Der lachende Mann – Bekenntnisse eines Mörders

Der lachende Mann – Bekenntnisse eines Mörders  is an East German film released in 1966. The title translates into English as The Laughing Man – Confessions of a Murderer.

Plot
Posing as West German journalists, East German documentary filmmakers Walter Heynowski and Gerhard Scheumann pay a visit to the notorious Nazi-turned-mercenary Siegfried “Kongo” Müller and interviewed him about his life and his participation in Congo's civil war.