In 1941 the VoMi was upgraded to an SS Main Office ("Hauptamt") with control over all VoMi personnel and field offices. In June 1941 VOMI was absorbed into the office of the Reich Commissioner for the Strengthening of German Ethnic Stock (RKFDV) run by Himmler. The RKFDV, as an SS-controlled organization, had the authority to say who was German, where ethnic Germans could live, and what populations should be cleared or annihilated in order to make room for the German settlers. As RKFDV chief, Himmler authorized the "SS-Einsatzgruppen" (mobile death squads) and other SS police units to round up and kill Jews, Slavs and Roma.