Stéphane Courtois is Director of Research at the Centre National de la Recherche Scientifique (CNRS) in Paris, and editor of the journal Communisme.
Nicolas Werth is a researcher at the Institute for Contemporary History.
Jean-Louis Panné collaborated on the Dictionnaire biographique du mouvement ouvrier français.
Andrzej Paczkowski is Deputy Director and a professor at the Institute for Political Studies of the Polish Academy of Sciences.
Karel Bartošek is acting head of research at CNRS and the editor of the journal La nouvelle alternative.
Jean-Louis Margolin is a lecturer in history and coordinator of lectures at the University of Provence and a researcher at the Research Institute on Southeast Asia of CNRS.