 The perpetrator of the Holocaust was the Nazi German "Wehrmacht" stationed in German-occupied Serbia.They carried out the operations with the assistance of the Milan Nedić's puppet government and Dimitrije Ljotić's fascist organization Yugoslav National Movement (Zbor), who both had joint control over the Banjica concentration camp in Belgrade, but the main Eengine of extermination was the regular German army.The murders were primarily carried out in concentration camps and gas vans.