In 1912 Sangnier founded a replacement group, the Young Republic League (Ligue de la jeune République) to promote his vision of social Catholicism.
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Le Sillon was finally condemned by the papal letter of 25 August 1910 Notre Charge Apostolique (Our Apostolic Mandate).
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In 1891, Pope Leo XIII called for the Church to adopt a more open involvement in social issues in his encyclical Rerum Novarum.
The Pope took issue with what he viewed as the socialist leanings of the Catholic 'Le Sillon' movement of Marc Sangnier.