Ilie B. Moscovici was a Romanian socialist militant and journalist, one of the noted leaders of the Romanian Social Democratic Party (PSDR). A socialist since early youth and a party member since its creation in 1910, he returned from captivity in World War I to lead the PSDR from Bucharest, and involved himself in a violent clash with the Romanian authorities. He mediated between reformist and Bolshevik currents, and helped establish the Socialist Party of Romania (PS) as a fusion of both tendencies. Moscovici served as a PS representative in Chamber, but was deposed over his instigation of the 1920 general strike, then imprisoned. Although he voted against the creation of a Communist Party from the rump PS and criticized Comintern interference in Romanian affairs, he was again apprehended in 1921. Together with the communists, he appeared as a defendant in the Dealul Spirii Trial.

The Labour and Socialist International was an international organization of socialist and labourist parties, active between 1923 and 1940. The group was established through a merger of the rival Vienna International and the Berne International, and was the forerunner of the present-day Socialist International.