How the OUN-UPA embraced ethnic violence, collaborated with Nazi Germany, and became one of the most controversial movements of World War II Burned villages. Families slaughtered in their homes. Women, children, and the elderly hacked to death with axes and pitchforks. Thousands of Jews beaten, tortured, and murdered during pogroms that accompanied the Nazi invasion of the Soviet Union. These are some of the atrocities associated with the Organization of Ukrainian Nationalists (OUN) and its