Dmytro Klyachkivsky ( ; 4 November 1911 - 12 February 1945 ) , also known by his pseudonyms Klym Savur , Okhrim , and Bilash , was a commander of the Ukrainian Insurgent Army ( UPA ) , first head-commander of the UPA-North . He was responsible for the ethnic cleansing of Poles from Volhynia
ethnic cleansing of Poles from Volhynia
Massacres of Poles in Volhynia and Eastern Galicia
Dmytro Klyachkivsky