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Georges Lefranc, a historian of socialism and syndicalism, was witness to the interest and disinterest the political and syndical world showed for sociology in the inter-war period. He was interviewed by Antoine Savoye in 1981 to explore the connections between sociologists and politicians as well as the use of sociology by political groups such as the CGT or the SFIO. By focusing on several personalities, such as Célestin Bouglé, Marcel Déat, Léon Blum, and Albert Thomas, this interview delves into the political and sociological network of the École normale supérieure. It also considers the lack of interest of political and labor unions for sociology during this period.