- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)1,174
- Bortstieber, Gertrud8
- Radio Free Europe/Radio Liberty, Inc - Research Institute8
- Soviet Red Archives5
- Hanák, Péter3
- Héderváry, Claire de3
- Institut zur Erforschung der UdSSR2
- Nóvé, Béla2
- Open Media Research Institute2
- Pohle, Heinz2
- Samizdat Archives2
- Alfred A. Reisch1
- Analytic Research Department1
- Balkan Section1
- Balogh, Eva S.1
- Baranskii, N. N.1
- Brandenstein, Béla1
- Bulgarian Unit1
- Communist International (Comintern)1
- Csákó, Mihály1