This article shows how one can read political history from evidence on corporate corruption. The study exploits newly discovered archival material from Banque de Paris et des Pays-Bas, a politically connected investment bank. We contribute to current research by replacing existing conjectures with precise qualitative and quantitative evidence. After reviewing previous works and providing a sketch of information repression and media control in France during the interwar period, we argue that the study of patterns of ‘informational criminality’ provides an original entry to the writing of political history and the history of information.