.mw-parser-output .hidden-begin{box-sizing:border-box;width:100%;padding:5px;border:none;font-size:95%}.mw-parser-output .hidden-title{font-weight:bold;line-height:1.6;text-align:left}.mw-parser-output .hidden-content{text-align:left}You can help expand this article with text translated from the corresponding article in Spanish. (April 2020) Click [show] for important translation instructions. View a machine-translated version of the Spanish article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Consider adding a topic to this template: there are already 5,200 articles in the main category, and specifying|topic= will aid in categorization. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Spanish Wikipedia article at [[:es:Izquierda Unida (Perú)]]; see its history for attribution. You should also add the template ((Translated|es|Izquierda Unida (Perú))) to the talk page. For more guidance, see Wikipedia:Translation.
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United Left (in Spanish: Izquierda Unida) was an alliance of leftist political parties in Peru founded in 1980 by Popular Democratic Unity (UDP), Revolutionary Left Union (UNIR), Peruvian Communist Party (PCP), Revolutionary Socialist Party (PSR), Revolutionary Communist Party (PCR) and FOCEP.

In 1984 UDP and a part of PCR converted itself into the Mariateguist Unified Party (PUM). PUM integrated itself in IU.

IU was led by Alfonso Barrantes Lingán (who lost to Alan García in the 1985 elections) up to 1987. In 1989 IU held its first congress. Gradually the IU disintegrated, with more and more groups deserting it.