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According to the provisions of the Law on Holidays, Memorial Days and Non-Working Days in the Republic of Croatia since 2002 Croatia has been celebrating 22 June as a holiday - Anti-fascist Resistance Day.
Anti-fascist Resistance Day is celebrated on 22 June, marking the forming of the First Sisak Partisan Detachment in the Brezovica forest near Sisak. It was the first anti-fascist formation not only in Croatia, but also in this part of Europe.
Starting from Sisak, the anti-fascist uprising in Croatia developed gradually, with the growing commitment of the Croatian people to the partisan movement. During the Second World War, in the parts of Croatia under the control of the anti-fascist movement, State anti-fascist Council for the National Liberation of Croatia (ZAVNOH) performed the supreme legislative and executive function. In 1945 ZAVNOH became People’s Parliament of Croatia preserving historical continuity of Croatian state sovereignty even during the people’s liberation struggle.
At the end of the Second World War in 1945, the People's Republic of Croatia was constituted as a federal unit of the then Federal People's Republic of Yugoslavia, which emerged from the Second World War as the winner on the side of the Allied forces.