International Mathematical Union ended in 1936.
International Mathematical Union was created in 1919.
International Seamen's Union ended in 1937.
International Typographical Union ended in 1986.
International Labor Union ended in 1887.
Retail Clerks International Union ended in 1979.
Cigar Makers' International Union ended in 1974.
International Trade Union Educational League ended in 1917.
International Working Union of Socialist Parties ended in 1923.
Italian Mathematical Union was created in 1922.
African Mathematical Union was created in 1976.
International Mathematical Olympiad was created in 1959.
International Commission on Mathematical Instruction was created in 1908.