The French Turn was the name given to the entry between 1934 and 1936 of the French Trotskyists into the Section Française de l'International Ouvrière (SFIO, the contemporary name of the French Socialist Party). The French Turn was repeated by Trotskyists in other countries during the 1930s.
The idea of the French Turn originated after the 6 February 1934 riots around the Stavisky Affair in 1934, which led to the downfall of the Daladier government. Fearing that fascists would seize power as they had in Germany and Italy, the Socialist Party (SFIO) and French Communist Party (PCF) formed a "United Front."
The Communist League, the French section of the International Left Opposition, remained at this time a small and predominantly middle-class organization. Leon Trotsky saw a great opportunity in the United Front for an expansion of the Trotskyists' ranks. While he saw no possibility of re-entering the Communist Party because of its lack of internal democracy, he believed that the Trotskyists could build a base in the SFIO, which had moved to the left under the leadership of Léon Blum. Trotsky formally proposed the "French Turn" into the SFIO in June 1934.
The Communist League's leaders were divided over the issue of entering the SFIO. While Raymond Molinier was the most supportive of Trotsky's proposal, Pierre Naville vocally opposed the motion, and Pierre Frank remained ambivalent. After two months of formal discussion, the League voted to dissolve into the SFIO in August 1934. In the Socialist Party, they formed the Bolshevik-Leninist Group (Groupe Bolchevik-Leniniste, GBL). Naville split from the group.