The Polish population transfers in 1944–1946 from the eastern half of prewar Poland (also known as the expulsions of Poles from the Kresy macroregion), were the forced migrations of Poles toward the end and in the aftermath of World War II. These were the result of a Soviet Union policy that had been ratified by the main Allies of World War II. Similarly, the Soviet Union had enforced policies between 1939 and 1941 which targeted and expelled ethnic Poles residing in the Soviet zone of occupation following the Nazi-Soviet invasion of Poland. The second wave of expulsions resulted from the retaking of Poland from the Wehrmacht by the Red Army. The USSR took over territory for its western republics.
The postwar population transfers were part of an official Soviet policy that affected more than one million Polish citizens, who were removed in stages from the Polish areas annexed by the Soviet Union. After the war, following Soviet demands laid out during the Tehran Conference of 1943, Kresy was formally incorporated into the Ukrainian, Belarusian and Lithuanian republics of the Soviet Union. This was agreed at the Potsdam Conference of Allies in 1945, to which the Polish government-in-exile was not invited.
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