| Business | Phone |
| American Federation-State Empl 200 Trapelo Rd, Waltham 2452 | (781) 891-8788 |
| Mail Handlers Union-New Englnd 200 Smith St, Waltham 2451 | (781) 684-9215 |
| International Hod Carriers 681 Main St # 2-7, Waltham 2451 | (781) 894-2750 |
| International Union-Electrical 152 Grove St, Waltham 2453 | (781) 899-0722 |