Congress of Industrial Organizations
noun
a federation of affiliated industrial labor unions, founded 1935 within the American Federation of Labor but independent of it 1938–55. Abbreviation: C.I.O., CIO
British Dictionary definitions for congress of industrial organizations
Congress of Industrial Organizations
noun
(in the US) a federation of industrial unions formed in 1935. It united with the AFL in 1955 to form the AFL-CIO
Abbreviation: CIO