 After that he directed the magazine "Ricerche religiose" ("Religious Researches").Those magazines were soon banned by the church and placed on the "Index Librorum Prohibitorum", the index of publications to be considered as forbidden to Catholic readers.On January 25, 1925 he was excommunicated, which was confirmed several times, because in his works he defended the ideas of modernism, particularly in "Il programma dei modernisti" ("The Modernists' Program", 1908) and "Lettere di un prete modernista" ("Letters from a Modernist Priest", 1908).