He was commonly known as " '' ' Brother Number Two ' '' " ( ) , as he was second-in-command to Khmer Rouge leader Pol Pot , General Secretary of the Party , during the Cambodian genocide of 1975 – 1979 . In 2014 , Nuon Chea received a life sentence for crimes against humanity , alongside another top-tier Khmer Rouge leader , Khieu Samphan , and a further trial convicted him of the crime of genocide in 2018
Cambodian genocide
Cambodian genocide
Nuon Chea