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- Amalgamated Transit Union
- ATU Local #19
- ATU Local #662
- ATU Local #1001
- American Federation of Government Employees
- AFGE Local #252 U.S. Dept of Education
- AFGE Local #695 U.S. Mint
- AFGE Local #709 DOJ
- AFGE Local #898 DOL
- AFGE Local #925 USDA
- AFGE Local #1014 VA
- AFGE Local #1105
- AFGE Local #1114
- AFGE Local #1116
- AFGE Local #1117
- AFGE Local #1127 TSA
- AFGE Local #1169
- AFGE Local #1194
- AFGE Local #1345 DOD
- AFGE Local #1867 DOD
- AFGE Local #2040
- AFGE Local #2186 DOC
- AFGE Local #2241 VA
- AFGE Local #2433 DOD
- AFGE Local #2477 DOD
- AFGE Local #3230 EEOC
- AFGE Local #3275 GSA
- AFGE Local #3392 GPO
- AFGE Local #3416 DOL
- AFGE Local #3499 USDA
- AFGE Local #3607 EPA
- AFGE Local #3806 ID
- AFGE Local #3824 DOE
- AFGE Local #3972 HUD
- AFGE Local #4012
- AFGE Local #4014 USCIS
- AFGE Local #4016
- American Federation of Musicians
- American Federation of State, County and Municipal Employees
- American Federation of Teachers
- AFT Local #203 Vocation Teachers Federation
- AFT Local #858 Denver Federation of Teachers
- AFT Local #1433 CU Faculty Federation
- AFT Local #1876 - CO WINS
- AFT Local #2265 Douglas County Federation of Teachers
- AFT Local #4462 Trinidad Federation of Teachers
- AFT Local #4463 Denver Federation of Paraprofessionals
- AFT Local #4520 Elizabeth Federation of Teachers
- AFT Local #6186 Colorado Classified School Employees Association
- AFT Local #6321 Metropolitan State Faculty Federation
- AFT Local #6463
- AFT Local #6541
- AFT Local #8005
- American Postal Workers United
- Air Line Pilots Association, International (ALPA)
- Bakery, Confectionery, Tobacco Workers and Grain Millers International Union
- Communications Workers of America
- International Alliance of Theatrical Stage Employees
- International Association of Fire Fighters
- International Association of Heat and Frost Insulators and Allied Workers
- International Association of Machinists and Aerospace Workers
- International Brotherhood of Boilermakers
- International Brotherhood of Electrical Workers
- International Brotherhood of Teamsters
- International Union of Bricklayers and Allied Craftworkers
- International Union of Elevator Constructors
- International Union of Operating Engineers
- International Union of Painters and Allied Trades
- IUPAT Local #79
- IUPAT Local #419
- IUPAT Local #930
- International Union of Police Associations
- International Association of Bridge, Structural, Ornamental and Reinforcing Iron Workers (IW)
- Laborers' International Union of North America (LIUNA)
- National Association of Letter Carriers (NALC)
- National Nurses United
- National Postal Mail Handlers Union
- NFL Players Association
- Office and Professional Employees International Union
- Operative Plasterers' and Cement Masons' International Association
- Professional Aviation Safety Specialists
- Screen Actions Guild and the American Federation of Television and Radio Artists
- Service Employees International Union
- Sheet Metal, Air, Rail & Transportation
- Transport Workers Union of America
- United Association
- Unite Here
- United Steelworkers
- United Union of Roofers, Waterproofers, and Allied Workers
