There's always ambiguity. People often say "billionaires" but if things get to the point of executing billionaires, it will probably keep going until the rich includes everyone with a white collar job. Or who wears glasses.

(on the evacuation of Cambodian cities)

"On arrival at the villages to which they had been assigned, evacuees were required to write brief autobiographical essays. The essay's content, particularly with regard to the subject's activity during the Khmer Republic regime, was used to determine their fate...those occupying elite professional roles were usually sent for reeducation, which in practice meant immediate execution or confinement in a labour camp"