The Indonesian Communist Party, known as Partai Komunis Indonesia (PKI), was founded in 1920 and became one of the largest communist parties in the world outside the Soviet Union. It played a significant role in Indonesian politics, especially during the struggle for independence from Dutch colonial rule. The PKI aimed to promote socialism and improve the lives of the working class. In 1965, a failed coup attempt led to a violent anti-communist purge, resulting in the mass killing of PKI members and sympathizers. This event marked the end of the party's influence in Indonesia, and it was officially banned. The legacy of the PKI remains a sensitive topic in Indonesian history.