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In page Italianization of South Tyrol:

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In religious affairs, a royal decree of November 1923 required religious instruction in Italian for all Italianized schools.[6] Fascist calls for the Italianization of German charitable organizations, religious orders and the complete abolition of German religious instruction to the Vatican were not entirely successful, not in the least due to the repeated interventions of the Bishop of Brixen and the setting up of informal Parish schools.[6] In state schools, though, Italian became mandatory for the last five classes, while the use of German was only allowed in teaching the Italian catechism in the first three years.[6]