text: In 1907 he was elected to the city council of Rome and was a member of the city government for one year. In the 1909 general elections he was elected to the Chamber of Deputies in the constituency of Mantua. During this time he was a strong advocate of support for Giovanni Giolitti, a liberal reformer, since he felt that this would allow Socialists to influence and contribute to progressive developments like the proposed introduction of universal suffrage. His positions, however, continued to remain a minority within the Socialist Party even if at this time the main leader was Turati, himself a reformist. In 1911 Bonomi dissented again with the party line by writing articles expressing lukewarm support for the invasion of Libya. In March 1912 he, along with other members of the right-wing of the Socialist Party, took the unprecedented move of meeting King Victor Emmanuel III to express their relief for the failure of an anarchist assassination attempt. This finally prompted his expulsion at the party congress held that year, where the more radical faction gained majority control.
  Those who had been expelled founded the Italian Reformist Socialist Party (PSRI), which won 3.92% of the vote and 19 seats in the 1913 elections.