This article needs to be updated.April 2016)(
|General Coordinator||Alberto Garzón|
|Founded||April 1986 (as coalition)|
2 November 1992 (as party federation)
|Youth wing||Área de Juventud de Izquierda Unida|
|Political position||Left-wing to far-left|
|National affiliation||Unidas Podemos|
|European affiliation||Party of the European Left|
|European Parliament group||European United Left-Nordic Green Left|
|Congress of Deputies|
|Local Government (2015)|
(Candidates gained in coalitions or unitary lists not included)
IU was founded as an electoral coalition of seven parties, but the Communist Party of Spain (PCE) is the only remaining integrated member of the IU at the national level. Despite that, IU brings together other regional parties, political organizations, and independents.
Following the electoral failure of the PCE in the 1982 (from 10% to 4%), PCE leaders believed that the PCE alone could no longer effectively challenge the electoral hegemony of the Spanish Socialist Workers' Party (PSOE) on the left. With this premise, the PCE began developing closer relations with other left-wing groups, with the vision of forming a broad left coalition. IU slowly improved its results, reaching 9% in 1989 (1,800,000 votes) and nearly 11% in 1996 (2,600,000 votes). The founding organizations were: Communist Party of Spain, Progressive Federation, Communist Party of the Peoples of Spain, PASOC, Carlist Party, Humanist Party, Unitarian Candidacy of Workers, and Republican Left.
In contrast to the PCE prior to the formation of IU, which pursued a more moderate political course, the new IU adopted a more radical strategy and ideology of confrontation against the PSOE. IU generally opposed cooperating with the PSOE, and identified it as a "right-wing party", no different from the People's Party (PP).
After achieving poor results in the 1999 local and European elections, IU decided to adopt a more conciliatory attitude towards the PSOE, and agreed to sign an electoral pact with the PSOE for the upcoming general election in 2000. They also adopted a universal policy in favor of cooperating with the PSOE at local level.
Following the election of Cayo Lara as leader in 2008, however, the party has shifted back towards a more confrontational attitude towards the PSOE.
IU currently has around 70,000 members.
|Communist Party of Spain (PCE)|
|Communist Youth Union of Spain (UJCE)|
|Feminist Party of Spain (PFE)|
|Open Left (IAb)|
|Republican Left (IR)|
|Revolutionary Workers' Party (POR)|
|Ecosocialists of the Region of Murcia (ESRM)|
|2011||Cayo Lara||with Plural Left||5||1||No|
|2015||Alberto Garzón||with Popular Unity||5||0||New election|
|2016||with Unidos Podemos||6||2||No (2016-18)|
|Apr-2019||with Unidas Podemos||3||2||New election|
|Nov-2019||with Unidas Podemos||0||0||Yes|
|1987||Fernando Pérez Royo||1,011,830||5.3||4th||--|
|2009||with The Left||0|
|2014||with Plural Left||2|
|2019||Sira Rego||with UPCE||2|