On 31 July 1941, Hermann Göring gave written authorization to SS-"Obergruppenführer" (Senior Group Leader) Reinhard Heydrich, Chief of the Reich Main Security Office (RSHA), to prepare and submit a plan for a "total solution of the Jewish question" in territories under German control and to coordinate the participation of all involved government organisations. The resulting "Generalplan Ost" (General Plan for the East) called for deporting the population of occupied Eastern Europe and the Soviet Union to Siberia, for use as slave labour or to be murdered. The minutes of the Wannsee Conference estimated the Jewish population of the Soviet Union to be five million, including nearly three million in Ukraine.