Deportation of Crimean Tatars by the Soviet Union.

The deportation of the Crimean Tatars or the Sürgünlik ('exile') was the ethnic cleansing and the cultural genocide of at least 191,044 Crimean Tatars that was carried out by Soviet Union authorities from 18 to 20 May 1944, supervised by Lavrentiy Beria, chief of Soviet state security and the secret police, and ordered by the Soviet leader Joseph Stalin. Within those three days, the NKVD used cattle trains to deport the Crimean Tatars, even Soviet Communist Party members and Red Army soldiers, from Crimea to the Uzbek SSR, several thousand kilometres away. They were one of several ethnicities that were subjected to Stalin's policy of population transfer in the Soviet Union.

Crimean Tatars, or simply Crimeans, are an Eastern European Turkic ethnic group and nation indigenous to Crimea. Their ethnogenesis lasted thousands of years in Crimea and the northern regions along the coast of the Black Sea, uniting Mediterranean populations with those of the Eurasian Steppe. Genome-wide study of the Crimean Tatars unveiled connections between them and the genomes of individuals from the Steppe during the Bronze Age, specifically those associated with the Yamnaya archaeological culture.

The Union of Soviet Socialist Republics (USSR), commonly known as the Soviet Union, was a transcontinental country that spanned much of Eurasia from 1922 until it dissolved in 1991. During its existence, it was the largest country by area, extending across eleven time zones and sharing borders with twelve countries, and the third-most populous country. An overall successor to the Russian Empire, it was nominally organized as a federal union of national republics, the largest and most populous of which was the Russian SFSR. In practice, its government and economy were highly centralized. As a one-party state governed by the Communist Party of the Soviet Union (CPSU), it was the flagship communist state. Its capital and largest city was Moscow.