Co-founder of the Khmer Rouge, the Communist Party of Kampuchea, in Cambodia who, in 2007, was arrested for crimes against humanity. He was charged with genocide in 2009 but died before the case against him could be brought to a verdict.
He was the Foreign Minister of Kampuchea from 1975 to 1979.
He was the brother-in-law of Pol Pot.
He studied in Paris and stated in the Latin Quarter which, at the time, was the center for student radicalism.
He married in 1951.