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Unitary Socialist Party Partito Socialista Unitario
Leaders	Giacomo Matteotti Filippo Turati Carlo Rosselli Giuseppe Saragat
Founded	October 1, 1922 (1922-10-01)
Banned	1 November 1925 June 19, 1930 (1930-06-19) (de facto dissolved)
Split from	Italian Socialist Party
Merged into	Italian Socialist Party
Headquarters	Rome, Italy
Newspaper	La Giustizia
Ideology	Democratic socialism Social democracy
Political position	Centre-left
International affiliation	Labour and Socialist International
Colors	Red
Politics of Italy Political parties Elections

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 party was founded in November 1922 by the reformist wing of the Italian Socialist Party (PSI) led by Rinaldo Rigola, Filippo Turati, Vittorio Emanuele Modigliani, Giacomo Treves, and Giacomo Matteotti, after they had been expelled in October. A staunch opponent of Benito Mussolini and Italian fascism, Matteotti was assassinated by Fascists, affiliated to OVRA, in June 1924. The event 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). 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.

Electoral results

See also

• Unitary Socialist Party (Italy, 1949)
• Unified Socialist Party (Italy)

References

1. "Rinaldo Rigola (Biella 1868 – Milano 1954)" (in Italian). Museo Torino. Retrieved 31 July 2022.
2. Brillanti, C. (2018). Le sinistre italiane e il conflitto arabo-israelo-palestinese: 1948-1973. Materiali e documenti (in Italian). Università La Sapienza. p. 230. ISBN 978-88-9377-098-9. Retrieved 25 January 2024.
3. Maurizio Degl’Innocenti, Matteotti, l’uomo e il politico, in Fondazione Giacomo Matteotti-Fondazione di studi storici Filippo Turati, Matteotti 100 nelle scuole, 2022, p. 25.
4. Kowalski, Werner. (1985). Geschichte der sozialistischen arbeiter-internationale: 1923 - 19. Berlin: Dt. Verl. d. Wissenschaften.

v t e Historical political parties in Italy
Communist	Proletarian Unity Party (1972–1984) Italian Communist Party (1921–1991) Proletarian Democracy (1978–1991) Party of Italian Communists (1998–2014)
Democratic socialist	Italian Revolutionary Socialist Party (1881–1893) Italian Workers' Party (1882–1892) Italian Socialist Party of Proletarian Unity (1964–1972) Democratic Party of the Left (1991–1998) Democratic Left (2007–2010) Left Ecology Freedom (2010-2016)
Green	Rainbow Greens (1989–1990) Federation of Green Lists (1986–1990) Federation of the Greens (1990–2021)
Social-democratic and liberal-socialist	Italian Reformist Socialist Party (1912–1926) Unitary Socialist Party (1922–1930) Action Party (1929–1947) Labour Democratic Party (1943–1948) Union of Socialists (1948–1949) Unitary Socialist Party (1949–1951) Unified Socialist Party (1966–1969) Italian Socialist Party (1892–1994) Italian Democratic Socialist Party (1947–1998) Labour Federation (1994–1998) Democrats of the Left (1998–2007) Italian Democratic Socialists (1998–2007) Article One (2017–2023)
Radical and social-liberal	Action Party (1853–1867) Italian Radical Party (1904–1922) Democratic Party (1913–1919) Social Democracy (1922–1926) Republican Democratic Concentration (1946) Radical Party (1955–1989) Democratic Alliance (1993–1997) The Network (1991–1999)
Centrist and centrist liberal	Constitutional Democratic Party (1913–1919) Italian Democratic Liberal Party (1919–1926) Democratic Union for the Republic (1998–1999) Union for the Republic Italian Renewal (1996–2002) The Democrats (1999–2002) Segni Pact (1993–2003) Democracy is Freedom – The Daisy (2002–2007) Civic Choice (2013–2019) Liberal Popular Alliance (2015–2018)
Regionalist and federalist	Movement for the Independence of Sicily (1943–1951) Italian Unionist Movement (1944–1948) Federalists and Liberal Democrats (1994–1996) Federalist Italian League (1995–1996) Great South (2011–2013)
Christian-democratic	Italian Catholic Electoral Union (1906–1919) Conservative Catholics (1913–1919) Italian People's Party (1919–1926) Christian Democracy (1943–1994) Italian People's Party (1994–2002) Christian Democrats for the Republic (1998) Christian Democratic Centre (1994–2002) United Christian Democrats (1995–2002) European Democracy (2001–2002) Christian Democracy for Autonomies (2005–2009) Union of Democrats for Europe (1999–2013)
Conservative-liberal	Liberal Union (1913–1922) Italian Liberal Party (1922–1994) National Democratic Alliance (1953–1954) Union of the Centre
Liberal-conservative	Economic Party (1919–1924) Forza Italia (1994–2009) The People of Freedom (2009–2013) Future and Freedom (2010–2014) New Centre-Right (2013–2017) Conservatives and Reformists (2015–2017) Direction Italy (2017–2019) Cambiamo! (2019–2022)
National-conservative	Common Man's Front (1946–1949) Monarchist National Party (1946–1959) People's Monarchist Party (1954–1959) Italian Democratic Party of Monarchist Unity (1959–1972) National Democracy (1977–1979) National Alliance (1995–2009)
Nationalist	Italian Nationalist Association (1910–1923) Combatants' Party (1919–1923) National Fascist Party (1921–1943) Republican Fascist Party (1943–1945) Italian Social Movement (1946–1995)
List of political parties in Italy 19th-century Italian political groups Early 20th-century Italian political parties 1950s–1990s Italian political parties Current Italian political parties

• Political parties established in 1922
• Defunct political parties in Italy
• Defunct social democratic parties in Italy
• Political parties disestablished in 1930
• Members of the Labour and Socialist International
• 1922 establishments in Italy
• Anti-fascist organisations in Italy