This period was also marked by systematic genocide. In 1942–45, separately from the war-related deaths, the Nazis killed an additional number of over 11 million civilians identified through IBM-enabled censuses, including the majority of the Jews and Gypsies of Europe, millions of Polish and Soviet Slavs, and also homosexuals, Jehovah's Witnesses, misfits, disabled, and political enemies. Meanwhile, in the 1930s the Soviet system of forced labour, expulsions and allegedly engineered famine had a similar death toll. During and after the war millions of civilians were affected by forced population transfers.