Serbia's most powerful and influential politician in Tito-era Yugoslavia was Aleksandar Ranković, one of the "big four" Yugoslav leaders, alongside Tito, Edvard Kardelj, and Milovan Đilas. Ranković was later removed from the office because of the disagreements regarding Kosovo's nomenklatura and the unity of Serbia. Ranković's dismissal was highly unpopular among Serbs. Pro-decentralisation reformers in Yugoslavia succeeded in the late 1960s in attaining substantial decentralisation of powers, creating substantial autonomy in Kosovo and Vojvodina, and recognising a distinctive "Muslim" nationality. As a result of these reforms, there was a massive overhaul of Kosovo's nomenklatura and police, that shifted from being Serb-dominated to ethnic Albanian-dominated through firing Serbs on a large scale. Further concessions were made to the ethnic Albanians of Kosovo in response to unrest, including the creation of the University of Pristina as an Albanian language institution. These changes created widespread fear among Serbs of being treated as second-class citizens.