In the period after World War Two until the establishment of today's independent state, Sabor’s organizational structure was modified several times.

The first Constitution of the People's Republic of Croatia dating from 1947 set up Sabor as the unicameral supreme body of state authority. Sabor's Presidium functioned as a sort of collective head of state and, in case of need, as Sabor’s plenum as well.

The 1953 Constitutional law of the People's Republic of Croatia redefined Sabor as a bicameral body made up of the Republic Council and the Council of Manufacturers. The 1963 Constitution of the Socialist Republic of Croatia established five councils of the Parliament: Republic Council, Economic Council, Educational and Cultural Council, Council on Welfare and Healthcare and Organizational and Political Council. The 1971 Constitutional amendments, extending Croatia's rights and responsibilities within the Socialist Federative Republic of Yugoslavia, founded the Presidency of the Parliament which, among other duties, was to represent the Socialist Republic of Croatia in the field of external affairs. The 1974 Constitution structured Sabor as composed of three councils: Council of Associated Labour, Municipality Council and Social and Political Council.

After the multi-party elections and passing the Constitution of the Republic of Croatia in 1990, Sabor’s structure was modified again so as to consist of the House of Representatives and the House of Counties. This very Parliament, lasting from 1990 to 1992, passed the decision on breaking the ties with the SFRY on 8 October 1991, thus completing its nation-building task. (Internet Editorial Staff)