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The Young Republic League (French: Ligue de la jeune république, LJR) was a French political party created in 1912 by Marc Sangnier, in continuation of Le Sillon, Sangnier's Christian social movement which was disavowed by the Pope Pius X (1835–1914). The LJR supported "personalist" Socialism, on the model of Emmanuel Mounier's theory of personalism.
The Abbé Pierre was member of the party for a short time after leaving the MRP.
Members of the LJR later joined the Union of the Socialist Left, the first movement including both Marxists and Social Christians.