Operation Keelhaul was carried out in Northern Italy by British and American forces to repatriate Soviet Armed Forces POWs of the Nazis to the Soviet Union between 14 August 1946 and 9 May 1947. The term was also the name of Julius Epstein's book about the operation.
One of the conclusions of the Yalta Conference was that the western Allies would return all Soviet citizens who found themselves in their zones to the Soviet Union. This immediately affected the liberated Soviet prisoners of war, but also extended to all Soviet citizens, irrespective of their wishes. In exchange, the Soviet government agreed to hand over several thousand western Allied prisoners of war whom they had liberated from German prisoner of war camps.
The refugee columns fleeing the Soviet-occupied parts of Europe included anti-communists, civilians, and Nazi collaborators from eastern European countries. They added to the mass of 'displaced persons' from the Soviet Union already in Western Europe, the vast majority of whom were Soviet prisoners of war and forced laborers (Ost-Arbeiter).
Soviet subjects who had volunteered for the German Army Ostlegionen and/or Waffen SS units were forcibly repatriated. These included Russian Cossacks of the XVth SS Cossack Cavalry Corps with their relatives, who were transported from the Western occupation zones of Allied-occupied Austria to the Soviet occupation zones of Austria and Allied-occupied Germany. Among those handed over were White émigré-Russians who had never been Soviet citizens, but who had fought for Nazi Germany against the Soviets during the war, including General Andrei Shkuro and the Ataman of the Don Cossack host Pyotr Krasnov. This was done despite the official statement of the British Foreign Office policy after the Yalta Conference, that only Soviet citizens who had been such after 1 September 1939, were to be compelled to return to the Soviet Union or handed over to Soviet officials in other locations (see the Repatriation of Cossacks after World War II).