 The agreement angered Serbian nationalists who opposed the agreement on the grounds that it weakened the unity of Serbdom in Yugoslavia, asserting its importance to Yugoslavia with the slogan "Strong Serbdom, Strong Yugoslavia".The agreement also angered Bosniaks (then known as Yugoslav Muslims), including the Yugoslav Muslim Organization (JMO) that denounced the agreement's partition of Bosnia and Herzegovina.A violent sectarian Croatian nationalism developed prior to World War II within the Ustaše movement of Ante Pavelić, which in turn collaborated with Nazi Germany and Fascist Italy in the Independent State of Croatia during World War II.