 The League of Communists claimed that the different nations of Yugoslavia had united in a common struggle against the Axis during the war and thus had legitimized the future unity of multi-ethnic Yugoslavia.This was broadly correct for some parts of Yugoslavia, but during the war there had been significant cooperation with the Axis powers in Croatia, which the Axis had established as a puppet state allied to Italy and Germany.In the early days of Yugoslavia, influential intellectuals Jovan Cvijić and Vladimir Dvorniković advocated the Yugoslavs as a Yugoslav supra-ethnic nation that had tribal ethnicities, such as Croats, Serbs, and others within it.