The United States government had intimate knowledge of the Indonesian army's bloody anti-communist purge in the 1960s, describing the mass killings as a "widespread slaughter", newly declassified documents have revealed.The 39 recently declassified US Embassy documents cover the period from 1964-1968, at the peak of the Cold War, and uncover new details about one of the most tumultuous periods in modern Indonesian history.Historians say up to 500,000 alleged Indonesian Communis