He supported Italian intervention in World War I. From 15 November 1914 to 1919, he was administrative director of Il Popolo d'Italia, a newspaper he co-founded with Benito Mussolini.
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Journalists in Italy who opposed the Fascist regime were arrested and imprisoned at the islands Lipari and Lampedusa along with other political prisoners.
Giovanni Battista Morgagni | Manlio Morgagni | Morgagni | Tito Manlio | Manlio Fabio Beltrones |
Between 1923 and 1927, he 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.
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In Milan, Arnaldo became managing director of the newspaper founded by his brother, Il Popolo d'Italia, succeeding Manlio Morgagni, who worked in advertising.