- Open Society Archives at Central European University8
- Radio Free Europe/Radio Liberty, Inc - Research Institute7
- Samizdat Archives4
- de Héderváry, Claire3
- American Refugee Committee2
- Csákó, Mihály2
- Fekete Doboz Alapítvány2
- Open Media Research Institute2
- Pallai, Péter2
- Soviet Red Archives2
- Witness, Inc.2
- BBC1
- Balogh, Eva S.1
- Bortstieber, Gertrud1
- British Broadcasting Corporation, Written Archive Centre1
- Bíró, András1
- Cséry, László1
- Great Britain, Foreign and Commonwealth Office1
- Group Inconnu1
- Hungarian Ministry of the Interior1