morial so far lists 82,085 names killed at the this concentration camp alone, out of around 100,000 estimated victims (75% of whom were of Serbian origin). Out of roughly 1,000,000 casualties in all of Yugoslavia up until 1944, around 250,000 were citizens of Serbia of different ethnicities, according to Zundhauzen. The overall number of Serb casualties in Yugoslavia was around 530,000, out of whom up to 400,000 in the Independent State of Croatia. The Republic of Užice was a short-lived liberated Yugoslav territory established by the Partisans and the first liberated territory in World War II Europe, organized as a military mini-state that existed in the autumn of 1941 in the west of occupied Serbia. By late 1944, the Belgrade Offensive swung in favour of the partisans in the civil war; the partisans subsequently gained control of Yugoslavia. The Syrmia front was the last sequence of the internal war in Serbia following the Belgrade Offensive. Between 70,000–80,000 people were killed in Serbia during the communist takeover.
The victory of the communist Partisans resulted in the abolition of the monarchy and a subsequent orchestrated constitutional referendum. A single-party state was soon established in Yugoslavia by the League of Communists of Yugoslavia. All opposition was repressed and people deemed to be promoting opposition to socialism or promoting separatism were imprisoned or executed for sedition. Serbia became a constituent republic within the SFRY known as the Socialist Republic of Serbia and had a republic-branch of the federal communist party, the League of Communists of Serbia. Serbia's most powerful and influential politician in Tito-era Yugoslavia was Aleksandar Ranković, one of the "big four" Yugoslav leaders, alongside Josip Broz Tito, Edvard Kardelj, and Milovan Đilas. In 1950, Ranković as minister of interior reported that since 1945 the Yugoslav communist regime had arrested five million people. Ranković was later removed from
