One of the conclusions of the Yalta Conference was that the Allies would return all Soviet citizens that found themselves in the Allied zone to the Soviet Union ( Operation Keelhaul ) . That immediately affected the Soviet prisoners of war liberated by the Allies , but was also extended to all Eastern European refugees . Outlining the plan to force refugees to return to the Soviet Union , the codicil was kept secret from the American and British people for over 50 years
Yalta Conference
Yalta Conference
Population transfer