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From 1921 Crispien was a member of the executive board of the International Working Union of Socialist Parties and since 1923 a delegate to the Labour and Socialist International.
After World War I, the Latvian Bund sent a representative, Raphael Abramovitch, to the Russian Social Democratic Labour Party (Menshevik) delegation at the founding Vienna conference of the International Working Union of Socialist Parties in 1921, where he was particularly active in association with the Menshevik leader Julius Martov.