As a student in Clermont-Ferrand at the relocated Strasbourg University, Julien Freund (1921-1993) took part in the local actions of the Groupe Franc de Combat. The theme of resistance later found its way into his work as a philosopher and political scientist. This study, based on hitherto unpublished archival documents, attempts to synthesise his scattered remarks in an attempt to identify the main thrust of his work.