| utu.org | United Transportation Union (UTU) |
| iaff.org | International Association of Fire Fighters |
| csea.com | California School Employees Association |
| iamaw.org | International Association of Machinists and Aerospace Workers |
| gmpiu.org | Glass, Molders, Pottery International Union (GMP) |
| cwa-union.org | Communications Workers of America |
| boilermakers.org | The Boilermakers Union |
| bmwe.org | Brotherhood of Maintenance of Way Employees |
| ble.org | Brotherhood of Locomotive Engineers and Trainmen |
| bctgm.org | The Bakery, Confectionery, Tobacco Workers and Grain Millers International Union |