 Magdelaine Paz and Jacques Mesnil conducted a tireless campaign on behalf of Serge, writing letters to left-wing journals, talking at conferences and meetings, canvassing influential lawyers and writers, and so on.They managed to turn the case of the writer imprisoned for his beliefs into a "cause célèbre".In August 1933 Magdeleine Paz was one of the signatories of an open letter addressed to Henri Barbusse protesting the fact that his periodical "Monde" had been silent about the case of Victor Serge.