- Labor United Against Busing1
- League for Industrial Democracy1
- Lewis, Anthony1
- Lewis, John, 1940-20201
- Lowenstein, Allard K.1
- Maddox, Lester, 1915-20031
- Mason, Gilbert R.1
- Massell, Sam1
- McCloud, J. Oscar (James Oscar), 1936-1
- Miller, Julia Wang1
- Mitchell, Clarence M. (Clarence Maurice), Jr., 1911-19841
- Moore, Ray, 1922-1
- Morgan, Charles, 1930-20091
- Morris, Aubrey R., 1922-20101
- Moultrie, Roy D., 19321
- Muhammad, Jessica1
- Murphy, Thomas Bailey, 1924-20071
- National Assembly for Social Policy and Development1
- National Association for the Advancement of Colored People1
- National Center for Research and Information of Equal Educational Opportunity1
