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United Socialist Party (Italy, 1922–30)

United Socialist Party
Partito Socialista Unitario
President Filippo Turati
Secretary Giacomo Matteotti
Founded October 1, 1922 (1922-10-01)
Dissolved June 19, 1930 (1930-06-19)
Split from Italian Socialist Party
Merged into Italian Socialist Party
Headquarters Rome, Italy
Newspaper La Giustizia
Ideology Social democracy
Political position Centre-left
International affiliation Labour and Socialist International
Colors      Red
Politics of Italy
Political parties

The United Socialist Party (Partito Socialista Unitario, PSU) was a social-democratic political party in Italy, active from 1922 to 1930.


The party was founded in November 1922 by the reformist wing of the Italian Socialist Party (PSI) led by Filippo Turati and Giacomo Matteotti, after they had been expelled in October. A staunch opponent of Benito Mussolini and Fascism, Matteotti was assassinated by Fascist thugs, affiliated to OVRA, in June 1924. The event provoked the Aventine Secession). Outlawed in November 1925, the PSU became active in clandestinity, as the Italian Workers' Socialist Party (Partito Socialista dei Lavoratori Italiani, PSLI). In June 1930 the PSLI re-joined the PSI.

Leading members and activists of the party included Sandro Pertini, Camillo Prampolini, Claudio Treves and Anna Kulischov.

The party was a member of the Labour and Socialist International between 1923 and 1930.[1]

Electoral results

Chamber of Deputies
Election year # of
overall votes
% of
overall vote
# of
overall seats won
+/– Leader
1924 422,957 (#3) 5.90
24 / 535
Giacomo Matteotti


  1. ^ Kowalski, Werner. Geschichte der sozialistischen arbeiter-internationale: 1923 - 19. Berlin: Dt. Verl. d. Wissenschaften, 1985.
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