for the creation of the Federated State of Serbia (), as a federated state within new Democratic Federal Yugoslavia. The process was formalised in April 1945, when the provisional People's Assembly of Serbia was created, also appointing the first People's Government of Serbia. Two newly created regions, Autonomous Province of Vojvodina and Autonomous Region of Kosovo and Metohija, decided to merge into Serbia. On November 29 (1945), Yugoslavia was officially proclaimed as federal republic, and in January 1946, after the first Constitution of federal Yugoslavia was adopted, the Federated State of Serbia was renamed to People's Republic of Serbia (). In November 1946, elections for the Constitutional Assembly of Serbia were held, and in January 1947, Constitution of Serbia was adopted, reaffirming its position within Yugoslav federation, and also regulating the position of autonomous units (Vojvodina as autonomous province; Kosovo and Metohija as autonomous region). In 1953, a constitutional law was adopted, introducing further social reforms. By that time, internal political life in Serbia was fully dominated by the Communist Party of Serbia, formed in May 1945 as a branch of the ruling Communist Party of Yugoslavia. In order to suppress remaining monarchist opposition, communists initiated the creation of a wider political coalition, thus establishing the People's Front of Yugoslavia (PFY), in August 1945. Other political parties were soon dissolved, and remnants of political life were constrained within the PFY, that was under full control of the ruling Communist Party. Socialist Republic of Serbia In 1963, a new Yugoslav Constitution was adopted, renaming the federal state into the Socialist Federal Republic of Yugoslavia, and its federal units into socialist republics, thus introducing the name: Socialist Republic of Serbia (). In 1966, one of the most prominent Serbs in the Communist party and also vice-president of Yugoslavia (1963–1966) and founder of Yugoslav intelligence agency OZNA, Aleksandar Ranković was removed from positions due to allegations of spying on SFRY President Josip Broz Tito. After the Croatian Spring in 1971, almost whole party leadership of Serbia was removed from office, under the charge of being "liberal". Latinka Perović and Marko Nikezić were marked as leaders of this liberal movement inside League of Communists of Serbia. In 1974, new constitution was adopted, increasing the powers of provinces, and making them de facto republics. For the first time the institution of president was formed, as President of the Presidency of Socialist Republic of Serbia. Assembly