In 1911, Morgari inaugurated his activity as a "diplomat of Socialism" with a trip to the Far East, which would become his main preoccupation in the years of World War I; he took part in preparing the Zimmerwald Conference, celebrated the October Revolution and Bolshevist Russia, and signed the April 1, 1919 letter that declared the PSI adherence to the Comintern.
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With Fascism and the March on Rome came a debate among socialists over the conflict and pacifism: in 1934, Morgari showed himself to be a partisan of an understanding with the Soviet Union, and called for defeatism to be applied as a revolutionary tactic in case Italy was to be led into war by Benito Mussolini.
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He began writing for 'La parola del Povero, the supplement of Grido del Popolo, the beginning of a career which brought him to the leadership of Avanti! in 1908, proving himself to be an advocate of incipient Social democracy (a reformist and pacifist).