Ustaše
Germany and Italy invaded Yugoslavia on 6 April 1941. On April 10, the most senior home-based Ustaša, Slavko Kvaternik, took control of the police in Zagreb and in a radio broadcast that day proclaimed the formation of the Independent State of Croatia (Nezavisna Država Hrvatska, NDH). Maček issued a statement that day, calling on all Croatians to cooperate with the new authorities.