The Indonesian Communist Party (PKI) was a political party in Indonesia that emerged in the early 20th century. Founded in 1920, it aimed to promote Marxist-Leninist ideology and sought to represent the working class. The PKI gained significant influence in the 1950s and 1960s, advocating for land reforms and social justice. In 1965, a failed coup led to a violent anti-communist purge, resulting in the deaths of hundreds of thousands of PKI members and sympathizers. The party was subsequently banned, and its legacy remains controversial in Indonesia's political history, impacting the country's approach to communism and leftist movements.