Scholars for 9/11 Truth (S9/11T)

School of the Americas Watch (SOAW)

Schooner Foundation

Schumann Center for Media and Democracy

Scientists and Engineers for Change (SEC)

Scientists for Global Responsibility (SGR)

Sea Change Foundation (SCF)

Secretary of State Project (SOSP)

Secure World Foundation (SWF)

Sentencing Project (SP)

September 11th Advocates (9/11 A)

September 11th Families For Peaceful Tomorrows (PT)

Service Employees International Union (SEIU)

Shadow Party (SP)

Shareblue Media (SM)

Shefa Fund

Sierra Club (SC)

Simons Foundation

Social Justice Leadership (SJL)

Socialist Alternative (SA)

Socialist Scholars Conference (SSC)

Sojourners

Solidarity

Solidarity USA (SUSA)

SourceWatch (SW)