This book is a collection of materials about the mass betrayal and cooperation of Ossetians with the Nazis during the Great Patriotic War with comments by the author. The book uses materials from the funds of the Central Archive of the Ministry of Defense of the Russian Federation, the Russian State Military Archive of the Russian Federation, the State Archive of the Russian Federation, the Central State Archive of the Republic of North Ossetia-Alania, the Central Archive of the FSB of Russia, as well as materials from well-known historians of Russia, including Ossetian, Chechen and others.