Since this tragic massacre the CIA’s own documents and interviews from the time have demonstrated that not only were the CIA and the US involved in documenting the events without intervention, but they supported army commanders and actually urged them to seize the opportunity to carry out the purge and establish a military dictatorship. CIA support to anti-Surkano rebels went back to the 1950s when Surkano failed to contain worker and peasant strikes than threatened Dutch, American and British banks, companies and plantations. The US continued training the Indonesian Army even after cutting aid to Sukarno’s regime, and US military presence was at its highest during 1965 when the relatively unknown General Suharto, who led the massacre and coup d’état that followed, enjoyed full open support from the US government.
According to Marshall Green, American ambassador to Indonesia, Washington was “generally sympathetic with and admiring” of Suharto's actions, expressing concerns at the time that “the army might not do enough to annihilate the PKI” . The US embassy under Marshall Green continued to supply radio equipment and small arms to Suharto’s forces throughout the massacre. Embassy officials even went so far as to supply a list of thousands of names of PKI members while the army carried out this campaign of terror against Indonesian civilians. American accountability for the PKI massacre needs greater recognition as by their own accounts they there fundamentally linked to the massacre at all stages.