Purge of Croatian Spring leaders starts in Yugoslavia at the meeting of the League of Communists at the Karađorđevo estate.

The Croatian Spring, or Maspok, was a political conflict that took place from 1967 to 1971 in the Socialist Republic of Croatia, at the time part of the Socialist Federal Republic of Yugoslavia. As one of six republics comprising Yugoslavia at the time, Croatia was ruled by the League of Communists of Croatia (SKH), nominally independent from the League of Communists of Yugoslavia (SKJ), led by President Josip Broz Tito. The 1960s in Yugoslavia were marked by a series of reforms aimed at improving the economic situation in the country and increasingly politicised efforts by the leadership of the republics to protect the economic interests of their respective republics. As part of this, political conflict occurred in Croatia when reformers within the SKH, generally aligned with the Croatian cultural society Matica hrvatska, came into conflict with conservatives.

The Socialist Federal Republic of Yugoslavia, known from 1945 to 1963 as the Federal People's Republic of Yugoslavia, commonly referred to as Socialist Yugoslavia or simply Yugoslavia, was a country in Central and Southeast Europe. It was established in 1945, following World War II, and lasted until 1992, dissolving amid the onset of the Yugoslav Wars. Spanning an area of 255,804 square kilometres (98,766 sq mi) in the Balkans, Yugoslavia was bordered by the Adriatic Sea and Italy to the west, Austria and Hungary to the north, Bulgaria and Romania to the east, and Albania and Greece to the south. It was a one-party socialist state and federation governed by the League of Communists of Yugoslavia, and had six constituent republics: Bosnia and Herzegovina, Croatia, Macedonia, Montenegro, Serbia, and Slovenia. Within Serbia was the Yugoslav capital city of Belgrade as well as two autonomous Yugoslav provinces: Kosovo and Vojvodina.

The League of Communists of Yugoslavia, known until 1952 as the Communist Party of Yugoslavia, was the founding and ruling party of SFR Yugoslavia. It was formed in 1919 as the main communist opposition party in the Kingdom of Serbs, Croats and Slovenes and after its initial successes in the elections, it was proscribed by the royal government and was at times harshly and violently suppressed. It remained an illegal underground group until World War II when, after the invasion of Yugoslavia in 1941, the military arm of the party, the Yugoslav Partisans, became embroiled in a bloody civil war and defeated the Axis powers and their local auxiliaries. After the liberation from foreign occupation in 1945, the party consolidated its power and established a one-party state, which existed in that form of government until 1990, a year prior to the start of the Yugoslav Wars and breakup of Yugoslavia.