An attempt by the Khmer Rouge to "start from scratch", after winning the Cambodian civil war. It was "Year Zero", and city-folk had to endure mass relocations to rural areas (or die), in order to help the nation build an agrarian communist utopia - you wonder if the KR ever bothered to read Marx. In the process, many "intellectuals" (e.g. people who wore glasses) were killed. The random murders and harsh labor left millions dead, unlucky mice in Pol Pot's mad-scientist labs.