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Collage of portraits of prisoners held at Tuol Sleng

Between 1975 and 1979, one of the great crimes of the 20th century was perpetrated: Some two million people died under the Khmer Rouge, a radical Communist regime that ruled Cambodia through a cruel and ruthless system of forced labor, persecution, and execution aimed at bringing about an agrarian utopia. The so-called Killing Fields, which took the lives of one quarter to one third of the population, was one of the largest cases of government-organized mass slaughter since the Holocaust. It has taken more than three decades for the world to try to hold the perpetrators of this crime accountable in trials that meet international standards of justice.