Legal and Political magazines
- Revolutionary Armed Forces of Colombia (FARC)
- Revolutionary Front for an Independent East Timor
- Revolutionary Nuclei
- Revolutionary People's Liberation Party/Front (DHKP/C)
- Revolutionary United Front (RUF)
- Rip in the Silk Industry
- Robbing the Poor to Pay the Rich
- Roosevelt, Franklin D
- Salafist Group for Call and Combat
- Santa Cruz Journal: A Protest, a Spy Program, and a Campus in an Uproar
- Scriptures for America
- Sea Shepherd Conservation Society
- Sedition Act of 1798
- Sedition Act of 1918
- Sendero Luminoso (Shining Path)
- Shiv Sena
- Sikh Militants
- Single Women of Boston Picket Relief Headquarters
- Sipah-e-Sahaba Pakistan (SSP)
- Skinheads