Labour and Socialist InternationalThe Labour and Socialist International (LSI; German: ''Sozialistische Arbeiter-Internationale,'' SAI) was an international organization of socialist and labour parties, active between 1923 and 1940. The group was established through a merger of the rival Vienna International and the former Second International, based in London, and was the forerunner of the present-day Socialist International.
The LSI had a history of rivalry with the Communist International (Comintern), with which it competed over the leadership of the international socialist and labour movement. However, unlike the Comintern, the LSI maintained no direct control over the actions of its sections, being constituted as a federation of autonomous national parties. Provided by Wikipedia