National Labor Organizations with Membership over 100,000
|2,731,419||National Education Association of the United States2|
|1,505,100||Service Employees International Union3|
|1,459,511||American Federation of State, County, and Municipal Employees|
|1,396,174||International Brotherhood of Teamsters3|
|1,311,548||United Food and Commercial Workers International Union|
|828,512||American Federation of Teachers|
|754,978||United Steelworkers of America|
|704,794||International Brotherhood of Electrical Workers|
|669,772||Laborers' International Union of North America|
|653,781||International Association of Machinists and Aerospace Workers|
|557,099||International Union, United Automobile, Aerospace, and Agricultural Implement Workers of America|
|545,638||Communications Workers of America|
|522,416||United Brotherhood of Carpenters and Joiners of America2|
|455,346||Union of Needletrades, Industrial, and Textile Employees|
|424,579||Longshore and Warehouse Union|
|392,584||International Union of Operating Engineers|
|324,043||United Association of Journeymen and Apprentices of the Plumbing and Pipe-Fitting Industry of the U.S. and Canada|
|292,221||National Association of Letter Carriers|
|286,700||American Postal Workers Union|
|271,463||International Association of Fire Fighters|
|269,204||National Postal Mail Handlers Union|
|245,011||Paper, Allied-Industrial, and Chemical International Union|
|226,975||American Federation of Government Employees|
|180,598||Amalgamated Transit Union|
|152,294||American Nurses Association2|
|148,806||Sheet Metal Workers International Association|
|127,278||International Brotherhood of Painters and Allied Trades|
|125,437||International Association of Bridge, Structural, Ornamental, and Reinforcing Iron Workers|
|125,398||Transport Workers Union of America|
|125,000||Building and Construction Trades|
|111,851||American Association of Classified School Employees2|
|105,460||The National Rural Letter Carriers' Association2|
1. Unless otherwise noted, unions are AFL-CIO affiliated.
2. Not AFL-CIO affiliated.
3. Severed ties with the AFL-CIO in July 2005.
Source: U.S. Department of Labor.
|Work Stoppages (Strikes) Involving 1,000 Workers or More||Labor Unions||Union Affiliation of Employed Wage and Salary Workers, 1983–2005|
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