| Local 897 Press | Publications |
| Local 94 News | Publications |
| Local 95 Union News | Publications |
| Local 969 UAW News | Publications |
| Local 974 News | Publications |
| Local Chatter | Publications |
| Loraine Labor Leader | Publications |
| Los Angeles Guildsman | Publications |
| Lumber Workers Bulletin | Publications |
| LUPA Newsline | Publications |
| Machinist | Publications |
| Machinists Monthly Journal | Publications |
| Manuals, Summer School and Education Conferences | Publications |
| Maple City Reporter | Publications |
| Maritime | Publications |
| Meeting Minutes, UAW Local 25 and Federal Labor Union #18386 | Publications |
| Meeting Proceedings | Publications |
| Members Bulletin | Publications |
| Members Forum | Publications |
| Memo from COPE | Publications |
| Memphis Guildsman | Publications |
| MESA Bulletin | Publications |
| MESA Educator | Publications |
| MESA News | Publications |
| MESA Voice | Publications |
| Metal World | Publications |
| Metropolitan Detroit Professionals | Publications |
| Mexico Labor News | Publications |
| Michigan AFL-CIO News | Publications |
| Michigan CIO News | Publications |
| Michigan CIO News - Maintainer Edition | Publications |
| Michigan Federal News | Publications |
| Michigan Federationist | Publications |
| Michigan Guild Reporter | Publications |
| Michigan Union Advocate | Publications |
| Michigan Worker | Publications |
| Michigan Worker | Publications |
| Midwest Labor Digest | Publications |
| Mill Hunk Herald | Publications |
| Milwaukee Guild News | Publications |
| Milwaukee Newspaper Guild News | Publications |
| Milwaukee Watchdog | Publications |
| Miners for Democracy | Publications |
| Miners Voice | Publications |
| Miners' Bulletin | Publications |
| Miner’s Voice | Publications |
| Mini 59er Reports | Publications |
| Minnesota Labor | Publications |
| Minutes of Monthly Delegates, Officer's Reports, Constitutions | Publications |
| Minutes of the Executive Board of the Congress of Industrial Organizations, 1935-1955 | Publications |
