Exodus of Turks from Bulgaria (1950–1951)
During the Cold War in 1950–1951, hundreds of thousands of Turks left the territory of the People's Republic of Bulgaria. The expulsion was planned by the Bulgarian government before it began, and the reason was to secure its national borders and expel the Turkish population.
Source: Wikipedia — Exodus of Turks from Bulgaria (1950–1951) (CC BY-SA 4.0)