He had a great affection for the region, and devoted many years to it, teaching at the aforementioned institution, as well as at elementary schools Carbona, in the municipality of San Vito.

As a tribute to this country that had welcomed him with affection, he called his eldest son Vito, after which the town reciprocated by placing, on behalf of Sanvitesi a plaque in the courtyard of the Falcon-Vial in memory of the beloved teacher.

[1] In Milan, Arnaldo became managing director of the newspaper founded by his brother, Il Popolo d'Italia, succeeding Manlio Morgagni, who worked in advertising.

[2] Between 1923 and 1927, Arnaldo dedicated himself to journalism and to various publishing ventures, creating a journal for the Opera Nazionale Balilla, the Domenica dell'Agricoltore (Sunday Farmer), Rivista Illustrata (Illustrated Review), which he co-founded with Manlio Morgagni, Illustrazione Fascista (Illustrated Fascism), Bosco e Historia (Forest and History), while continuing to lead Il Popolo d'Italia.

Arnaldo Mussolini had an important part in defusing the cooled relations between the Fascist regime and the Catholic Church during the crisis of 1931, especially regarding the education of youth.

[citation needed] In September, thanks to Arnaldo Mussolini, a compromise was reached, whereby the young Catholics could organize just inside the Azione Cattolica Italiana, without performing any political activities.

While Ida Dalser was interned in a mental hospital, Arnaldo – whether because of orders he received, or through personal affection, it is not clear – treated his nephew Benito Albino in the best possible way.

In the church of Santa Maria Nuova, at Mercato Saraceno, a plaque was installed under orders of Benito Mussolini to mark the burial ground.