- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)294
- Open Society Archives at Central European University14
- Mao, Zedong13
- Rákosi, Mátyás9
- Djilas, Milovan8
- Magyar, Bálint7
- Trotsky, Leon7
- Héderváry, Claire de6
- Nagy, Imre6
- Ulam, Adam B.5
- Brzezinski, Zbigniew4
- Kautsky, Karl4
- Rühle, Jürgen4
- Staar, Richard Felix4
- Bahro, Rudolf3
- Bukharin, Nikolai Ivanovich3
- Caute, David3
- Furet, François3
- Gramsci, Antonio3
- Hegedüs, András3