The years of World War II were a time not only of the tragedies of entire nations and the heroism of those who fought against fascism, but also of vile betrayal. In the vast expanses from the English Channel to the Caucasus, there were many traitors... For decades, Europe avoided the unpleasant conversation about Ukrainian guards, Latvian police officers, Polish peasants, French mayors and Norwegian ministers, but all of them took part in Nazi crimes. Without them, the Germans could not have coped, they would not have killed so many people. The SS, police, and Wehrmacht did not have enough manpower to control all the occupied territories. In the new book, L. Mlechin talks about what motivated people who, having betrayed their homeland and their people, served the Germans and therefore became criminals themselves.