Wartime collaboration occurred in every country occupied by Nazi Germany during the Second World War, including the Baltic states. The three Baltic republics of Estonia, Latvia and Lithuania, were occupied by the Soviet Union in the summer of 1940, and were later occupied by Germany in the summer of 1941 and then incorporated, together with parts of the Byelorussian Soviet Socialist Republic of the Soviet Union (modern Belarus), into the Reichskommissariat Ostland.[1] Collaborators with Germany participated in the Eastern Front against the Soviet Union, as well as in the Holocaust, both in and outside of the Baltic states. This collaboration was done through formal Waffen-SS divisions and police battalions, as well as through spontaneous acts during the opening of the war.