Dipa Nusantara Aidit was an Indonesian communist politician, who served as General Secretary of the Communist Party of Indonesia (PKI) from 1951 until his summary execution during the mass killings of 1965–66. Born on Belitung Island, he was nicknamed "Amat".

The Communist Party of Indonesia was a communist party in the Dutch East Indies and later Indonesia. It was the largest non-ruling communist party in the world before its violent disbandment in 1965. The party had two million members in the 1955 elections, with 16 percent of the national vote and almost 30 percent of the vote in East Java. During most of the period immediately following the Indonesian Independence until the eradication of the PKI in 1965, it was a legal party operating openly in the country.