- Hegedüs, András2
- Hermann, István1
- Historical Archives of the Hungarian State Security1
- Hopkins, Mark W.1
- Hungarian Institute for Public Opinion Research1
- Hungarian Ministry of the Interior3
- Huszadik Század Hangja Kutatóműhely1
- IAkushevskii, I. T. 1
- Index on Censorship1
- Information Services Department1
- Institut istorii (Akademiia nauk SSSR). Leningradskoe otdelenie1
- Institut zur Erforschung der UdSSR1
- International Helsinki Federation for Human Rights1
- Jablonický, Jozef1
- Joy, C. Turner1
- Judit, Miklósy1
- Karsai, Elek1
- Kaser, Michael Charles1
- Kekkonen, Urho1
- Kemény, István3