Entryism was used to connect with and recruit leftward-moving political currents inside radical parties. Similar tactics were also used by Trotskyist organisations in other countries, including the Netherlands, Belgium, Switzerland, and Poland. The Trotskyists of the Workers Party of the United States also successfully used their entry into the Socialist Party of America to recruit their youth group and other members. However, entryism lasted briefly since the leadership of the SFIO started to expel the Trotskyists. Proponents of the tactic advocated that the Trotskyists should enter the social democratic parties to connect with revolutionary socialist currents within them and then to steer those currents toward Leninism. The tactic was adopted in August 1934, despite some opposition, and successfully raised the group's membership to 300 activists.

In June 1934, he proposed for the French Trotskyists to dissolve their Communist League and to join the French Section of the Workers' International (SFIO) and for the Communist League to dissolve its youth section to join more easily with revolutionary elements. The ' French Turn' refers to the classic form of entrism advocated by Leon Trotsky in his essays on 'The French Turn'. ( September 2020) ( Learn how and when to remove this template message) Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources.

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