Fedorenko was one of approximately 5,000 Trawniki men trained as Holocaust executioners by SS-Hauptsturmführer Karl Streibel from Operation Reinhard.[6] The Hiwi shooters, known in German as the Trawnikimänner, were deployed to all major killing sites of the Final Solution, augmented by the SS and Schupo, as well as Ordnungspolizei formations. The German Order Police performed roundups inside the Jewish ghettos in German-occupied Poland shooting everyone unable to move or attempting to flee, while the Trawnikis conducted large-scale civilian massacres in the same locations.[2] It was their primary purpose of training.[7] In the spring of 1942 Fedorenko was deployed from Trawniki to the Lublin Ghetto. It is known from historical record that between mid-March and mid-April 1942 over 30,000 Jews from Lublin Ghetto were transported to their deaths in cattle trucks at the Bełżec extermination camp and additional 4,000 at Majdanek.[8][9] Fedorenko claimed in his postwar hearing that he was issued a rifle which was not fired.