The civil war that followed the Bolshevik seizure of power drove the largest political emigration in Europe of the period. The evacuation of General Wrangel's army and accompanying civilians from the Crimea in November 1920 put some 150,000 people ashore at Constantinople; others left through the Baltic ports, through Poland and through Vladivostok and Harbin. Estimates of the number of former Russian subjects settled abroad by 1921 range from 1 to 3 million, concentrated in Berlin, Paris, Prague, Belgrade, Harbin and Constantinople. Soviet decrees of 1921-22 stripped most of them of citizenship, leaving them stateless, and the League of Nations responded by appointing Fridtjof Nansen High Commissioner for Refugees and creating the Nansen passport, an identity certificate that allowed stateless refugees to cross borders. The arrangement was the foundation of the modern international refugee regime, and Nansen received the Nobel Peace Prize in 1922 for this and for his work on prisoner repatriation and Russian famine relief.
The Bolshevik government, the White armies and the intervening powers fought across the former Russian Empire; defeated forces and civilians evacuated from the Crimea, the Baltic and the Far East and were resettled abroad under League of Nations arrangements
The empire's population was about 166 million in 1914 on official estimates, and the territory of the future USSR held roughly 140-147 million in 1917-20. Estimates of the white emigration range from about 900,000 to 2 million, with the League of Nations Nansen office registering around 1.5 million Russian refugees in the early 1920s; total excess deaths from the civil war, famine and epidemics are put at 7-12 million.
Deaths in the civil war as a whole, including the terrors, the epidemics and the 1921-22 famine, are usually put at 7 to 12 million, but they are treated in the separate entries on the terrors and the famine. The emigration itself was not directly lethal, though many died of typhus and destitution in the transit camps around Constantinople and Gallipoli in 1920-21.
Soviet decrees of 1921-22 deprived emigres of citizenship, rendering them stateless, which is the fact that produced the League of Nations Nansen passport arrangement.
Russia, Bulgaria, Germany, China