In the period of World War II in Yugoslavia Nazi Germany with its allies and client regimes invaded and divided Yugoslavia. Direct Nazi and client regimes crimes included Holocaust in Croatia and Serbia, Genocide of Serbs, Chetnik war crimes and other. The communist-led republican Yugoslav Partisans evolved into Europe's most effective anti-Axis resistance movement. During the flight and expulsion of Germans in the immediate post-war years majority of Germans of Yugoslavia left the country.