- Bortstieber, Gertrud4
- Pallai, Péter4
- Radio Free Europe/Radio Liberty, Inc - Research Institute3
- Samizdat Archives3
- Hanák, Péter2
- Nóvé, Béla2
- Balkan Section1
- Balogh, Eva S.1
- British Broadcasting Corporation, Written Archive Centre1
- Capra, Frank1
- Ciano, Galeazzo1
- Communist International1
- Communist International (Comintern)1
- Dangerfield, Elma1
- Garner, Frank Harold1
- Gray, Alexander1
- Great Britain, Foreign and Commonwealth Office1
- Hegedüs, András1
- Ivens, Joris1
- Kautsky, Karl1