The deportation of Koreans in the Soviet Union (Russian: Депортация корейцев в СССР; Korean: 고려인의 강제 이주) was the forced transfer of nearly 172,000 Soviet Koreans (Koryo-saram) from the Russian Far East to unpopulated areas of the Kazakh SSR and the Uzbek SSR in 1937 by the NKVD on the orders of Soviet leader Joseph Stalin and Chairman of the Council of People's Commissars of the Soviet Union Vyacheslav Molotov. 124 trains were used to resettle them 6,400 km (4,000 miles) to Central Asia. The reason was to stem "the infiltration of Japanese espionage into the Far Eastern Krai", as Koreans were at the time subjects of the Empire of Japan, which was the Soviet Union's rival. However, some historians regard it as part of Stalin's policy of "frontier cleansing". Estimates based on population st