Hoxha also fought for the expansion of federal aid and development programs in Kosovo, which led to Kosovo's rapid industrialization throughout the 1960s and 1970s. Hoxha also led or otherwise supported political battles for the expansion of cultural and educational institutions in the Albanian language, leading to the virtual eradication of illiteracy among the Albanian population and the establishment of the Albanian-language University of Pristina in 1970, as well as a Kosovo Academy of Arts and Sciences. During his political career in socialist Yugoslavia, Hoxha subscribed to the principles of Yugoslav policy of "brotherhood and unity", believing in the need to achieve national equality between Albanians, Serbs, and other national groups within Kosovo and Yugoslavia. In practice, given the grave cultural and economic backwardness which previous regimes had left Albanians in Kosovo, Hoxha believed that overcoming the disadvantages faced by Albanians required special affirmative measures both within Kosovo and at the federal level. Kosovo had inherited the highest illiteracy rates in all of Yugoslavia and was also its poorest region. Hoxha consistently initiated or supported policies which would address these problems, including expanding the educational opportunities of Albanians, expanding Yugoslav programs supporting industrial development in Kosovo, and policies addressing the relative inequality of Albanians in employment, who had disproportionately high unemployment rates. Hoxha held a number of high posts in Kosovo and Yugoslavia. He served as president of the Assembly of the Kosovo Autonomous Province. He also received the title of People's Hero of Yugoslavia. In 1967 he was appointed to the Yugoslav Communist Party Presidium and in 1974 became a member of the Federal Presidency. In 1978-79 he held the rotating post of Vice President of the Federal Presidency, the highest leadership post in Yugoslavia under Tito. In 1981, Hoxha faced harsh criticism from radical Kosovo Albanian nationalist movements because of his opposition to the massive demonstrations that occurred in the spring of that year, which demanded republican status for Kosovo. Hoxha and the Kosovar provincial leaders also faced criticism by the Yugoslav party leadership for failures in curtailing the rise of Albanian nationalism in Kosovo. After the rise of Slobodan Milošević in Serbia, Hoxha, though retired, became subject to a number of political attacks labelling him a nationalist and supporter of secessionism. Hoxha was expelled from the League of Communists of Yugoslavia and in 1991 the Milošević government tried him for treason. After his retirement in 1986, Hoxha had withdrawn from public life and was notorious for refusing to grant interviews to the press.