Russia’s Federal Security Service has declassified a Soviet investigation into underground nationalist Ukrainian groups Top clergy of the Ukrainian Greek Catholic Church (UGCC) actively collaborated with the Nazis during World War II, Russia’s Federal Security Service has said, citing a declassified Soviet probe. The investigation, published on Monday, asserts that between 1930 and 1960, UGCC priests maintained close ties with the Organization of Ukrainian Nationalists (OUN) – a movement that