The Truman Doctrine was an American foreign policy that wanted to counter Soviet Geopolitical expansion during the Cold War
Answer: The Khmer Rouge is the name which was popularly given to members of the Communist Party of Kampuchea and by extension it was also given to the regime through which the CPK ruled Cambodia between 1975 and 1979. The name had been coined in the 1950s by Norodom Sihanouk as a blanket term for the Cambodian left.
It’s 4 million but I guess 3 is close to it