Unitary Socialist Party (Italy, 1922)

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

Unitary Socialist Party

Partito Socialista Unitario
LeadersGiacomo Matteotti
Filippo Turati
Carlo Rosselli
Giuseppe Saragat
FoundedOctober 1, 1922 (1922-10-01)
DissolvedJune 19, 1930 (1930-06-19)
Split fromItalian Socialist Party
Merged intoItalian Socialist Party
HeadquartersRome, Italy
NewspaperLa Giustizia
IdeologySocial democracy
Democratic socialism
Political positionCentre-left to left-wing
International affiliationLabour and Socialist International
Colors     Red


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 Fascists, 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 Oddino Morgari, 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 resultsEdit

Chamber of Deputies
Election year Votes % Seats +/− Leader
1924 422,957 (3rd) 5.90
24 / 535
Giacomo Matteotti


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