- Orlov, Alexander1
- Osipov, Aleksandr Aleksandrovich1
- Partito comunista italiano1
- Pasternak, Boris Leonidovich1
- Petrowsky, A.1
- Pipes, Richard1
- Polish Unit of RFE/RL Research Institute; RFE/RL RI1
- Pushkash, Andrei Ivanovich1
- Riasanovsky, Nicholas Valentine1
- Robertson, A. H.1
- Romanian Unit1
- Rumiantsev, Pavel Mikhailovich1
- Rühle, Jürgen1
- Safran, Nadav1
- Salomon, Charlotte1
- Samizdat Archives of Radio Free Europe1
- Schapiro, Leonard Bertram1
- Schneider, Johannes1
- Scigliano, Robert G.1
- Selsam, Howard1