Names
- Rogers, Grant, 1907-1
- Schaber, Will1
- Schaefer, James1
- Schaefer, Katherine1
- Schaefer, Lois (Perret)1
- Schaefer, Susan1
- Schwarzchild, Henry1
- Seeger, Pete, 1919-1
- Seward, William H. (William Henry), 1801-1872.1
- Sheet Metal Workers' International Association1
- Siemsen, Harry1
- Siena College1
- Simons, Hans, 1893-19721
- Smykla, John Ortiz1
- Socialist Labor Party1
- Socialist Party of the United States of America1
- Socialist Party of the United States of America. Dover Local1
- Soutine, Chaim, 1893-19431
- Soyer, Moses, 1899-19741
- Spaziano, Joseph1