In Serbia, Holocaust distortion and denial is manifested in the downplaying of Milan Nedić and Dimitrije Ljotić's roles in the extermination of Serbia's Jews in concentration camps in Nedić’s Serbia, by a number of Serbian historians. Serb collaborationist armed forces, including the Chetniks, were involved, either directly or indirectly, in the mass killings of mainly Jews and Roma as well as Croats, Muslims and those Serbs who sided with any anti-German resistance. Since the end of the war, Serbian collaboration in the Holocaust has been the subject of historical revisionism by Serbian leaders.