 During 1968 , Cambodia 's indigenous communist movement , labeled Khmer Rouge ( Red <unk> ) by Sihanouk , began an insurgency to overthrow the government . While they received very limited material help from the North Vietnamese at the time ( the Hanoi government had no incentive to overthrow Sihanouk , since it was satisfied with his continued " neutrality " ) , they were able to shelter their forces in areas controlled by PAVN / NLF troops . 
