Informbiro

Informbiro (also the Informbiro period or the Time of the Informbiro) was a period in the history of Yugoslavia which spanned from 1948 to 1955, characterised by conflict and schism with the Soviet Union. The word Informbiro is the Yugoslav name for the Cominform, an abbreviation for "Information Bureau," from "Communist Information Bureau".

The term refers to the Cominform Resolution of June 28, 1948 (resulting from the Tito–Stalin Split) that accused the Communist Party of Yugoslavia (KPJ), among other things, of "depart[ing] from Marxism-Leninism", exhibiting an "anti-Soviet attitude," "meeting criticism with hostility" and "reject[ing] to discuss the situation at an Informbureau meeting." Following these allegations, the resolution expelled the KPJ from Cominform. As a result, Yugoslavia fell outside of the Soviet sphere of influence, and the country's brand of communism, with its independence from the Soviet line, was called Titoism by Moscow and considered treasonous. Party purges against suspected "Titoites" were conducted throughout Eastern Europe.

Significant evidence supports the opinion that the actual reason for the Cominform Resolution was the unwillingness of Josip Broz Tito to obey the instructions of Joseph Stalin. The most serious disputes concerned policy in the Balkans. In particular, Yugoslavia was considered to be pushing too fast towards unification with Bulgaria and Albania. Although following Stalin's proposal for a series of such unifications, Tito was seen to be proceeding without proper consultation with Moscow. Another issue was Tito's eagerness to export revolution to Greece, in contravention of Stalin's Percentages Agreement with the capitalist powers.

...
Wikipedia