This paper deals with state and law problems of Croatia, from 1941. to 1945. In the midst of socio-political circumstances in Europe, Hitler wanted from Kingdom of Yugoslavia to join The Tripartite Pact. The Yugoslav goverment agrees, but a part of the Royal Army's officers, assissted by the United Kingdom, execute a revolution, expressing their dissatisfaction with joining. Third Recih, on April 06, 1941, attacks Yugoslavia, and short-term war ends with capitulation on April 17, 1941. Meanwhile, with the will of Italy and Third Reich, in the area of occupied Yugoslavia, a new state was created under their protectorate. It was Independent State of Croatia, which was formed on April 10, 1941, led by Ante Pavelic. On the other hand, the Communist Party of Yugoslavia has decided to launch a general uprising in order to free Yugoslav teritory from occupation, and create a new, Yugoslav state. Accordingly, the Anti-Fascist Council of the National Liberation of Yugoslavia is established, which becomes the political representation of all the Yugoslav peoples, and in its Second Session it become a supreme legislative body. Also, Anti-Fascist Council of the National Liberation of Croatia was established, which acts as a factual government. At its Third Session it becomes the carrier of the sovereignty of the Croatian people. At the end of the Second World War, the National Liberation Movement led by Tito becomes the key negotiating party, and an agreement is reached for the formation of the first government, which will be tricked by Communist government, and on November 29, 1945. they will create Federal People's Republic of Yugoslavia.