- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)1,838
- Soviet Red Archives3
- Nóvé, Béla2
- Open Society Archives at Central European University2
- Radio Free Europe/Radio Liberty, Inc - Research Institute2
- Balkan Section1
- Bortstieber, Gertrud1
- Bukharin, Nikolai Ivanovich1
- Bulgarian Unit1
- Communist International (Comintern)1
- Czechoslovak Unit1
- Fekete Doboz Alapítvány1
- Fondation pour une entraide intellectuelle européenne, FEIE1
- Havemann, Robert1
- Honcoop, Haruna1
- Hummer, Franz1
- International Helsinki Federation for Human Rights1
- Lukács, György1
- Mayenburg, Ruth von1
- Mlynář, Zdeněk1