 Croatian nationalism reached a critical point in its development during World War II, when the Croatian extreme nationalist and fascist Ustaše movement took to governing the Independent State of Croatia (NDH) after the invasion of Yugoslavia by the Axis Powers and the creation of the NDH at the behest of Fascist Italy and Nazi Germany as an Italo-German client state.The Ustaše committed mass genocide against Serbs, Jews and Roma, and persecuted political opponents, including the communist Yugoslav Partisans and Chetniks who fought against them.After the defeat of the Axis Powers in 1945 and the rise of communist Josip Broz Tito as leader of a new communist-led Yugoslavia, Croatian nationalism along with other nationalisms were suppressed by state authorities.