United Socialist Party (Italy, 1922–1930)

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The United Socialist Party (Italian: Partito Socialista Unitario, PSU) was a socialist political party in Italy 1922-1930.

The party was founded Filippo Turati and Giacomo Matteotti in November 1922 by the reformist wing of the Italian Socialist Party (PSI), after it had been expelled on October 1. A staunch opponent of Benito Mussolini and Fascism, it became the focus of attention after Matteotti's assassination by the Fascist Ceka in June 1924 (an event which provoked the Aventine Secession). Outlawed in November 1925, the PSU became active in clandestinity, as the Italian Socialist Workers' Party (Partito Socialista dei Lavoratori Italiani, PSLI) - from 1927, the United Italian Socialist Workers' Party (Partito Socialista Unitario dei Lavoratori Italiani, PSULI). In June 1930, PSULI re-entered the PSI.

Other notable activists of the first PSU included Oddino Morgari, Sandro Pertini, Camillo Prampolini, Claudio Treves, and the former anarchist Anna Kulischov (who was also Turati's wife).