Who? Communists
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Set up a brutal communists government under cambodia into communists society. Pol pots followers slaughtered 2 million people. Almost on a quarter of nations. The vietnam invaded in 1978, overthrew the Khmer Rouse and installed a less government vietnamese with threw in 1989 by 1970s tyhe ideology of Khmer combined its own ideas with anticolonialist ideas of the PCF. Pol pot was a key leader in the movement after combodia.