Aktion Weichsel
Operation Vistula (; ) was a codename for the 1947 forced resettlement of the Ukrainian minority including Boykos and Lemkos from the south-eastern provinces of post-war Poland, to the Recovered Territories in the west of the country. The action was carried out by the Soviet-installed Polish communist authorities with the aim of removing material support and assistance to the Ukrainian Insurgent Army. The Ukrainian Insurgent Army continued its guerilla activities until 1947 in both Subcarpathian and Lublin Voivodeships with no hope for any peaceful resolution. Operation Vistula effectively brought an end to the hostilities.