Labour and Socialist International
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.
Arthur Henderson (1863–1935) of the British Labour Party was chosen as the first chairman of the executive committee of the LSI in 1923.
The Socialist International (SI) is a political international or worldwide organisation of political parties which seek to establish democratic socialism, consisting mostly of social-democratic political parties and labour organisations.
Willy Brandt with outgoing secretary general Bernt Carlsson (left) and new secretary general Pentti Väänänen (right) at the Socialist International Congress in 1983