This is not correct. The Wannsee conference took place in January 1942, concentration camps were actively killing during 1942. Before that there were the mobile

This is not correct. The Wannsee conference took place in January 1942, concentration camps were actively killing during 1942. Before that there were the mobile killing units, the SS Einsatzgruppen that already systematically killed more than a million Jews in the occupied parts of the Soviet Union during 1941-1942.