Socialist Party of Indonesia

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Socialist Party of Indonesia (Partai Sosialis Indonesia- PSI) was an Indonesian political party founded by Sutan Sjahrir. The party (originally called simply the "Socialist Party", "Partai Sosialis") was a major force at the time of the Indonesian National Revolution. However it was divided into left-wing and right-wing factions. The left-wing led by Amir Sjarifuddin, including the youth league Pesindo, joined the People's Democratic Front led by PKI in 1948. This group was eventually submerged into the PKI. The right-wing led by Sjahrir became the PSI and turned increasingly anticommunist. It was very influential in the early 1950s, but performed poorly in the 1955 elections.

When a rebellion against Sukarno erupted in 1958, and a Revolutionary Government of the Republic of Indonesia (PRRI) was declared on the outer islands, some elements of the PSI, but not Sjahrir himself, supported the coup. On this pretext, Sukarno banned the PSI in 1960.