| Business | Phone |
| National Writers Union Boston 186 Hampshire St, Cambridge 2139 | (617) 661-1476 |
| Cambridge Public Employees 255 Bent St # 3, Cambridge 2141 | (617) 354-1110 |
| Cambridge Teachers Assn 2464 Massachusetts Ave, Cambridge 2140 | (617) 492-4709 |
| Harvard Union-Clerical Tchncl 1306 Massachusetts Ave # 203, Cambridge 2138 | (617) 661-8289 |
| Local 30 Iaff Cambridge 2029 Massachusetts Ave, Cambridge 2140 | (617) 876-5267 |
| Laborers International Union 238 Main St # 310, Cambridge 2142 | (617) 876-8081 |