Italian Socialist Party of Proletarian Unity#History

{{Expand Italian|topic=hist|Partito Socialista Italiano di Unità Proletaria|date=January 2023}}

{{Infobox political party

| colorcode = {{Party color|Italian Socialist Party of Proletarian Unity}}

| name = Italian Socialist Party of Proletarian Unity

| native_name = Partito Socialista Italiano di Unità Proletaria

| logo = Partito Socialista Italiano di Unità Proletaria logo.svg

| logo_size = 150px

| general_secretary = Tullio Vecchietti

| president = Lelio Basso

| spokesperson = Dario Valori

| abbreviation = PSIUP

| foundation = {{start date|1964|1|12|df=y}}

| dissolved = {{end date|1972|7|13|df=y}}

| split = Italian Socialist Party

| merged = Italian Communist Party

| headquarters = Rome, Italy

| newspaper = Mondo nuovo

| ideology = Socialism
Marxism
Frontism
Factions
Pro-Soviet Union{{cite book |last1=Stebbins |first1=Richard Poate |last2=Amoia |first2=Alba |date=1970 |title=Political Handbook and Atlas of the World, 1970: Governments and Intergovernmental Organizations as of September 1, 1969, with Supplementary Data Through January 1, 1970 |url=https://books.google.com/books/about/Political_Handbook_and_Atlas_of_the_Worl.html?id=j2GQAM9_QzoC |publisher=Simon and Schuster |page=170 |isbn=0671202111 |access-date=2025-04-24 |quote=At its second congress, held in Dec. 1968, the party enlarged its central com-mittee to include representatives of its extremist pro-Castro, pro-Chinese wing but reiterated its call for alliance with the Communist party and support for Moscow.}}
Pro-Castro
Pro-China
Revolutionary socialism
Libertarian socialism

| membership = 200,000{{cite book |last1=Stebbins |first1=Richard Poate |last2=Amoia |first2=Alba |date=1970 |title=Political Handbook and Atlas of the World, 1970: Governments and Intergovernmental Organizations as of September 1, 1969, with Supplementary Data Through January 1, 1970 |url=https://books.google.com/books/about/Political_Handbook_and_Atlas_of_the_Worl.html?id=j2GQAM9_QzoC |publisher=Simon and Schuster |page=170 |isbn=0671202111 |access-date=2025-04-24 |quote=Formed in Jan. 1964 as a breakaway Socialist group which opposed participation in the Moro government, the PSIUP has a membership of approximately 200,000.}}

| membership_year = 1970

| position = Left-wing
Factions
Far-left

| international =

| european =

| colours = {{Color box|{{party color|Italian Socialist Party of Proletarian Unity}}}} Red

| country = Italy

| flag = Flag of Italian Socialist Party of Proletarian Unity.svg

}}

The Italian Socialist Party of Proletarian Unity (Partito Socialista Italiano di Unità Proletaria, PSIUP) was a political party in Italy, active from 1964 to 1972.

History

The PSIUP was formed on 12 January 1964 by a leftist section of the Italian Socialist Party (PSI).{{cite journal|author=Valdo Spini |title=The New Left in Italy|journal=Journal of Contemporary History|date=January-April 1972|volume=7|issue=1-2|page=56|jstor=259757 |doi=10.1177/002200947200700103}} PSIUP had been the PSI's name in 1943–1947. The new PSIUP was led by Tullio Vecchietti. Other leading members were Lelio Basso, Vittorio Foa, Lucio Libertini, Emilio Lussu, Francesco Cacciatore detto Cecchino and Dario Valori. The new party attracted PSI militants who were dissatisfied with the close cooperation between the PSI and the Christian Democracy.{{cite journal |last=Moss |first=David |date=1981 |title=The kidnapping and murder of Aldo Moro |journal=European Journal of Sociology / Archives Européennes de Sociologie / Europäisches Archiv für Soziologie |volume=22 |issue=2 |pages=265–295 |issn=0003-9756 |jstor=23999304}} Instead, the founders of the PSIUP favoured cooperation with the Italian Communist Party (PCI).

On 13 July 1972, following a disappointing electoral result, the PSIUP split. The majority, led by Libertini, Valori and Vecchietti, joined the PCI. The rightist minority, led by Giuseppe Avolio, Nicola Corretto and Vincenzo Gatto, rejoined the PSI. The leftist minority, led by Foa and Silvano Miniati, continued to work under the name PSIUP, and in December 1972 they established the Proletarian Unity Party (PdUP). A Posadist faction within the PSIUP published the Bollettino della sinistra rivoluzionaria del PSIUP between 1965 and 1967.

Electoral results

=Italian Parliament=

class=wikitable style="width:50%; border:1px #AAAAFF solid"
colspan=6\|Chamber of Deputies
width=13%\|Election year ! width=16%\|Votes ! width=6%\|% ! width=1%\|Seats ! width=8%\|+/− ! width=19%\|Leader
1968 \| 1,414,697 (5th) \| 4.5 \| {{Composition bar\|23\|630\|hex=Red}} \| {{center\|–}} \| {{center\|Tullio Vecchietti}}
1972 \| 648,591 (8th) \| 1.9 \| {{Composition bar\|0\|630\|hex=Red}} \| {{center\|{{decrease}} 23}} \| {{center\|Tullio Vecchietti}}

class=wikitable style="width:50%; border:1px #AAAAFF solid"

colspan=6|Chamber of Deputies

width=13%|Election year

! width=16%|Votes

! width=6%|%

! width=1%|Seats

! width=8%|+/−

! width=19%|Leader

1968

| 1,414,697 (5th)

| 4.5

| {{Composition bar|23|630|hex=Red}}

| {{center|–}}

| {{center|Tullio Vecchietti}}

1972

| 648,591 (8th)

| 1.9

| {{Composition bar|0|630|hex=Red}}

| {{center|{{decrease}} 23}}