- Radio Free Europe/Radio Liberty Research Institute (RFE/RL Research Institute)16
- Samizdat Archives4
- Samizdat Archives of Radio Free Europe2
- Analytic Research Department1
- Butts, Antony1
- Communist International (Comintern)1
- Gershtein, A.1
- Goba, Kaspars1
- Greytak, Sharon1
- Hegedüs, András1
- Ivanova, Julia1
- Karandashov, Sergey1
- Király, Béla1
- Komandarev, Stephan1
- Kun, Miklós1
- Open Society Archives at Central European University1
- Polish Unit of RFE/RL Research Institute; RFE/RL RI1
- Rechinsky, Juri1
- Roussilon, Thomas1
- Schulz, Moritz1