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From Wikipedia, the free encyclopedia. The American Federation of Labor (AFL) was a national federation of labor unions in the United States. It was founded in Columbus, Ohio, in December 1886 by an alliance of craft unions disaffected from the Knights of Labor, a national labor association.
Definition of union: An organization of workers joined to protect their common interests and improve their working conditions. Definition of union: An organization of workers joined to protect their common interests and improve their working conditions. Use union in a sentence. â The union had negotiated the terms of the employees employment so there were no unclear or ambiguous issues that could arise.