- Samizdat Archives of Radio Free Europe1
- Scottish League for European Freedom1
- Syrkin, Marie1
- Szabó, Miklós1
- Terlecki, Tymon1
- Toynbee, Arnold1
- Trotsky, Leon1
- United States of America, Department of State1
- United States, National Archives and Records Administration1
- United States. Congress. Senate. Committee on Foreign Relations1
- Varga, László1
- Volin, B. M.1
- Wielhorski, Władysław1
- Yutkevich, Sergei1