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In page Socialist Party of Indonesia:

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In December 1945 Amir Sjarifoeddin's Socialist Party of Indonesia (Parsi) and Sutan Sjahrir's Socialist People's Party (Parsas), both of which had only recently been established, merged to form the Socialist Party. Sjahrir became leader of the combined party. It was popular among young intellectuals and students as well as members of the underground movements led by the two men during the Japanese occupation of Indonesia.[1] At the end of 1945 the Socialist Party gained five of the 25 seats on the working committee of the Central Indonesian National Committee, the de facto legislature.[2] Both Sutan and Amir served terms as prime minister, while other Socialist Party members held senior cabinet posts.[3]