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In some areas, civilian militia knew where to find known Communists and their sympathisers, while in others the Army demanded lists of Communists from village heads.[22] PKI membership was not disguised and most suspects were easily identified within communities.[23] The American Embassy in Jakarta supplied the Indonesian military with lists of up to 5,000 suspected Communists.[24] Although some PKI branches organised resistance and reprisal killings, most went passively to their deaths.[25] Not all victims were PKI members. Often the label “PKI” was used to include anyone to the left of the Indonesian National Party (PNI).[26] In other cases victims were suspected or simply alleged Communists.[10]

http://en.wikipedia.org/wiki/Indonesian_killings_of_1965%E2%80%9366

These documents have enabled to gain a much clearer understanding of the precise role of the United States, Britain, Australia and other western governments in both attempting to provoke an armed takeover of Indonesia in 1965 and in supporting the mass killings by the army and civilian groups which followed the September 30 movement. Prior to the last few years scholars have largely speculated on the role of the American Central Intelligence Agency and other western intelligence agencies in pursuing covert operations aimed at provoking an armed conflict between the Indonesian army and the Indonesian communist party or the PKI. But these declassified documents lay out a picture of active engagement with one of the great atrocities of the 20th century, and make the United States and other western governments de facto accomplices in this campaign of mass murder that stretched through the end of 1965 and into 1966.[76]