“Scattered throughout Europe, most notably in Yugoslavia, there were also anti-communist emigres: White Russians, that is, who had lost their fight against the Bolsheviks and settled in the West. Stalin wanted them back too: no one was to be allowed to escape Bolshevik retribution.
“In the end, he got them. Among the many controversial decisions they made at the Yalta Conference in February 1945, Roosevelt, Churchill, and Stalin agreed that all Soviet citizens, whatever their individual history, must be returned to the Soviet Union. Although the protocols signed at Yalta did not explicitly command the Allies to return Soviet citizens against their will, that, in effect, is what happened.” (Applebaum, Gulag: A History, p.436)