The organization of the Communications Workers of America (CWA) in 1947 was the culmination of nearly a half-century of struggle for telephone unionism. Until the middle 1890s there was very little union activity among telephone workers. In 1898 the International Brotherhood of Electrical Workers (IBEW) began to organize some of the telephone linemen and cable splicers. Numerous strikes by the IBEW in the 1910s were unsuccessful. However, during these years there was an upsurge of union membership among telephone operators mostly centered in Boston. A joint organizing campaign by the IBEW and Women's Trade Union League won major concessions in 1914-1915. However, after a failed strike in 1919, the Bell Telephone Company began to promote company unions and fought all organizing drives.

The passage of the Wagner Act in 1936, which removed all the legal barriers to industrial union organization, reinvigorated the campaign for telephone unionism. However, progress was slow as telephone workers were for the most part insulated from the worst effects of the Great Depression. The Bell Company's response to the Wagner Act that outlawed company unions was to transform them into so-called independent labor organizations (non AFL or CIO) that could claim to be in compliance with national labor laws. During the early CIO years from 1937 through 1942 union organizing proceeded slowly in the telephone industry. The focus was on amalgamating the various local unions that were plant, craft, or district based into a national federation.

In 1939 the National Federation of Telephone Workers (NFTW) was formed but this organization was weak and decentralized. Stagnant wages and deteriorating working conditions during World War II stimulated telephone worker solidarity and union amalgamation. When Joseph A. Beirne was elected President of NFTW in 1943 the union began a full-scale organizing campaign. In 1946 there was a nation wide strike that led to the first national agreement with the American Telephone and Telegraph Company (AT&T). However, AT&T forced another strike in 1947. When this strike collapsed, the NFTW structure fell apart and the CWA was born.

During the next twenty-five years, the CWA, under the leadership of Joseph A. Beirne, moved aggressively to organize all the telephone workers in the United States. Not until 1974, after years of labor-management unrest and a series of strikes, that AT&T agreed to system wide collective bargaining. Shortly after the national contract was signed, Joseph A. Beirne died and was replaced as President by Secretary-Treasurer Glenn E. Watts.

In the 1980s, the CWA began to expand beyond telecommunications, creating a Public Employees Department that successfully organized 34,000 New Jersey state workers in 1981. In 1985, Morton Bahr became the CWA President. In 1987, the CWA merged with the International Typographical Workers Union. In 1992, it absorbed the National Association of Broadcast Employees and the Newspaper Guild merged with the CWA.