In 1943 – 1944 , Ukrainian nationalists associated with the Organization of Ukrainian Nationalists ( OUN ) and the Ukrainian Insurgent Army perpetrated the Massacres of Poles in Volhynia and Eastern Galicia . Estimates of the number of Polish civilian victims vary greatly , from tens to hundreds of thousands
Massacres of Poles in Volhynia and Eastern Galicia
Massacres of Poles in Volhynia and Eastern Galicia
History of Poland