Operation Vistula – ethnic cleansing of Ukrainians, Poland 1947
200K forcibly forcibly resettled 2 fmr German terr pic.twitter.com/3WFIQ7bkSM— Tat Atfender (@TatAtfender) July 22, 2016
It is certainly worth noting that at the same time, the Soviets were resettling Poles from Western Ukraine into Poland.