Abstract: Records of the American Communications Association (ACA), a labor union affiliated with the International Brotherhood of Teamsters which represents workers in the telegraph, radio, and other communications industries. The collection documents the structure and activities of the union, and includes publications, grievance, contract, and negotiation materials; testimony presented to congressional committees and the Federal Communications Commission; information on employers and disputes with rival unions; and scrapbooks of newspaper clippings. Locals which are well-represented include Broadcast Local 1, 10, 111, and Teleregister Local 876. Employers include American Cable & Radio Corporation, American Telephone and Telegraph, Mackay Radio Telegraph, Postal Telegraph Company, Radio Corporation of America (RCA), MCI, TRT, and Western Union Telegraph Company. Extensive files document ACA’s opposition to the merger of Western Union and Postal Telegraph.