In the aftermath of the 1974 constitution, concerns over the rise of Albanian nationalism in Kosovo rose with the widespread celebrations in 1978 of the 100th anniversary of the founding of the League of Prizren. Albanians felt that their status as a "minority" in Yugoslavia had made them second-class citizens in comparison with the "nations" of Yugoslavia and demanded that Kosovo be a constituent republic, alongside the other republics of Yugoslavia. Protests by Albanians in 1981 over the status of Kosovo resulted in Yugoslav territorial defence units being brought into Kosovo and a state of emergency being declared resulting in violence and the protests being crushed. In the aftermath of the 1981 protests, purges took place in the Communist Party, and rights that had been recently granted to Albanians were rescinded – including ending the provision of Albanian professors and Albanian language textbooks in the education system.