Industrial Workers of the World (IWW)
- International Brotherhood of Teamsters (IBT)
- Laborers’ International Union of North America (LIUNA)
- Service Employees International Union (SEIU)
- United Brotherhood of Carpenters and Joiners of America (UBC)
- United Farm Workers of America (UFW)
- United Food and Commercial Workers International Union (UFCW)
American Federation of Labor and Congress of Industrial Organization (AFL-CIO)
Labor Notes – Coverage of the union movement and efforts to make unions accountable to their members.