- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)294
- Open Society Archives at Central European University14
- Mao, Zedong11
- Djilas, Milovan8
- Magyar, Bálint7
- Trotsky, Leon7
- Héderváry, Claire de6
- Nagy, Imre5
- Brzezinski, Zbigniew4
- Staar, Richard Felix4
- Ulam, Adam B.4
- Bahro, Rudolf3
- Bukharin, Nikolai Ivanovich3
- Furet, François3
- Gramsci, Antonio3
- Kommunisticheskaia partiia Sovetskogo Soiuza3
- Laqueur, Walter3
- Lichtheim, George3
- Open Media Research Institute3
- Radio Free Europe/Radio Liberty, Inc - Research Institute3