- SAG AFTRA
- AFGE Local 948
- AFM Local 171
- AFSCME 24 (Council 93)
- AFSCME 1776
- Springfield Federation of Paraprofessionals 4098
- APWU Local 497
- ATU Local 448
- ATU Local 1512 (Peter Pan)
- BAC – Bricklayers Local 3
- IUE/CWA 81288 (Eastman)
- HFIAW – Insulators – Asbestos 6
- FIREFIGHTERS IAFF 108
- FIREFIGHTERS IAFF 1710
- IAM 743 (Machinists- Dist Lodge 26)
- IATSE Local 53
- IATSE Local 232
- IBB – Boilermakers Local 1851
- IBEW Local 455
- IBEW Local 1228
- IBEW Local 2324 (Verizon)
- Operating Eng 98 IUOE
- IUOE 877
- IUPAT Local 35 – Painters
- IUPAT DC 11 Local 1333
- Ironworkers Local 7
- NALC 46
- Amherst Pelham Education Assoc. (MTA/NEA)
- Belchertown Education Association (MTA/NEA)
- Chicopee Education Association (MTA/NEA)
- Easthampton Education Association (MTA/NEA)
- Gateway Education Association (MTA/NEA)
- Greenfield Education Association (MTA/NEA)
- MA Society of Professors – MSP (MTA/NEA)
- NASE -Northampton Association of School Employees (MTA/NEA)
- PSU (MTA/NEA) – Professional Staff Union
- SEA (MTA, NEA) – Springfield Education Assoc.
- South Hadley Education Assoc. (MTA/NEA)
- United Educators of Pittsfield (MTA/NEA)
- West Springfield Teachers Union (MTA/NEA)
- Univ. Staff Assoc. USA 9005 (MTA/NEA)
- MNA 1
- OPEIU 6
- OPEIU 277 – Amer. Income Life
- PASS – NG3 Prof Aviation Safety Specialists
- SEIU Local 509
- SEIU Local 888
- SEIU Local 1199
- UAW Local 9A
- UAW Local 2110
- UAW Local 2320 (Legal Svcs Workers)
- UAW Local 2322
- UFCW Local 1459
- USW – Steelworkers 7912