- Noël, Léon1
- Nyiszli, Miklós1
- Open Society Archives at Central European University1
- Plekhanov, Georgii Valentinovich1
- Poland. Polskie Siły Zbrojne. Dywizja Pancerna, 1.1
- Położyński, Antoni1
- Pudovkin, Vsevolod1
- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)1
- Razumnyi, Alexander1
- Reves, Emery1
- Rochemont, Richard de1
- Romanian Unit1
- Roucek, Joseph S.1
- Rákosi, Mátyás1
- Samizdat Archives of Radio Free Europe1
- Schenkel, Gotthilf Adolf1
- Schulberg, Stuart1
- Scottish League for European Freedom1
- Stalin, Joseph1
- Syrkin, Marie1