In 1899 he moved to Milan to become editor of the daily Il Tempo, which under his stewardship became a leading voice for greater democracy and the Italian Reformist Socialist movement.
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As a result of the division in the socialist movement between 'Maximalists' and Reformists, in 1922, with Turati, Giacomo Matteotti, and Treves founded the Partito Socialista Unitario (PSU).
Claudio Monteverdi | Claudio Roditi | Claudio Arrau | Claudio Reyna | Cláudio Taffarel | Claudio Scimone | Claudio Procesi | Claudio Baglioni | Claudio Lolli | Claudio Cecchetto | Claudio Magris | Trèves | Claudio Naranjo | Sergio Claudio dos Santos | Renato Treves | Claudio Marrero | Claudio Marchisio | Claudio Chiappucci | Claudio Bravo | Claudio Bisio | Sir Frederick Treves, 1st Baronet | Sir Frederick Treves | Simon Treves | Claudio Vargas | Claudio Treves | Claudio Taffarel | Claudio Stampi | Claudio Scarchilli | Claudio Scajola | Claudio Saracini |
Deprived of resources, writers such as Turati, Anna Kulischov, Giacomo Matteotti, Claudio Treves, and Carlo Rosselli continued to defend the democratic order which was being swept swept away by the Fascists, and total censorship loomed.