René Marx Dormoy (1 August 1888 – 26 July 1941) was a French socialist politician, noted for his opposition to the far right. Under his leadership as Minister of the Interior in the government of Léon Blum, the French police infiltrated "La Cagoule," which was planning the overthrow of the French Third Republic, led by the Popular Front government. Dormoy directed the arrest and imprisonment of 70 cagoulards in November 1937. The police recovered 2 tons of armaments from their sites.