Created in April 1930 as a secret entryist tendency within the PCF, the Ligue communiste organized around the magazine La Vérité,[1] launched in August 1929 under the direction of Alfred Rosmer.
Rosmer, under direct instruction from Leon Trotsky, sought to unify two rival factions of French Trotskyism, divided primarily by personal disputes.
[2] After disputes, Naville and Rosenthal ousted Molinier and Frank from leadership roles, angering Trotsky, who sought arbitration through an international delegation including Andrés Nin and Amadeo Bordiga in 1931.
After the 6 February 1934 riots, Trotsky advocated for entryism, which led the Ligue communiste to join the SFIO and form the Bolshevik-Leninist group.
The approach faced challenges, and at the SFIO Congress in Mulhouse (June 1935), Trotskyists were sidelined as Léon Blum favored alignment with the French Communist Party.