Operation Vistula
Operation Vistula (Polish: Akcja Wisła; Ukrainian: Опера́ція «Ві́сла», romanized: Operatsiya "Visla") was the codename for the 1947 forced resettlement of close to 150,000 Ukrainians, Rusyns, Boykos, and Lemkos from the southeastern provinces of postwar Poland to the Recovered Territories in the north and west of the country. The action was carried out by the Soviet-installed Polish communist authorities to remove material support to the Ukrainian Insurgent Army.