Unitary Socialist Party (Italy, 1922)
social-democratic political party in Italy, active from 1922 to 1930
The Unitary Socialist Party (Partito Socialista Unitario, PSU) was a democratic socialist political party in Italy active from 1922 to 1930. Its outlook was reformist and anti-fascist.
History
The PSU was founded on 4 October 1922 by the reformist wing of the Italian Socialist Party (Partito Socialista Italiano, PSI). The new party was led by Giacomo Matteotti, Vittorio Emanuele Modigliani, Rinaldo Rigola, Claudio Treves, and Filippo Turati after they had been expelled at the PSI party congress in October.
A staunch opponent of Benito Mussolini and Italian fascism, Matteotti was assassinated by a fascist secret police squad on 10 June 1924, an event that provoked the Aventine Secession. Outlawed in November 1925, the PSU remained active as the clandestine Italian Workers' Socialist Party (Partito Socialista dei Lavoratori Italiani, PSLI). On 19 July 1930, the PSLI re-joined the PSI. Leading members and activists of the party included Anna Kuliscioff, Oddino Morgari, Sandro Pertini, Camillo Prampolini, Carlo Rosselli, Giuseppe Saragat, and Treves. The party was a member of the Labour and Socialist International between 1923 and 1930.
The same PSU name was adopted in 1949 after Saragat and others left the PSI. In 1969, a new PSU was formed following the split from the unified PSI and Saragat's Italian Democratic Socialist Party (Partito Socialista Italiano Democratico, PSDI) and was favourable to the continuation of the organic centre-left governing coalition. This group reverted to the PSDI name in 1971.
Begin with the source’s own compact description: “Unitary Socialist Party (Italy, 1922)” is social-democratic political party in Italy, active from 1922 to 1930. The dossier treats that line as a proposition to test through Unitary, Socialist and Party, not as a finished interpretation.
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Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Sep 13, 2026. The linked authority identifier is Q1265926. VIAF identifies the subject as 156270696. 2 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1922, 1930, 1924 and 1925.
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This entry incorporates text from “Unitary Socialist Party (Italy, 1922)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.