Noam Chomsky assessed that the death toll in Cambodia may have been inflated 'by a factor of a thousand'... To me, this recalls other CIA-sponsored stories of Red atrocities, be it Stalin's Terror or the Ukrainian Holodomor ... [The Vietnamese] supported the black legend of genocide to justify their own bloody intervention." In 2013, the Cambodian Prime Minister Hun Sen passed legislation which makes illegal the denial of the Cambodian genocide and other war crimes committed by the Khmer Rouge. The legislation was passed after comments by a member of the opposition, Kem Sokha, who is the deputy president of the Cambodian National Rescue Party. Sokha had stated that exhibits at Tuol Sleng were fabricated and that the artifacts had been faked by the Vietnamese following their invasion in 1979. Sokha's party have claimed that the comments have been taken out of context. Estimates of the number of Cambodians who died during the four years of Khmer Rouge rule have been controversial and range from less than one million to more than three million. Kiernan, head of the Cambodian Genocide Project at Yale University, estimated that the Khmer Rouge were responsible for 1.5 million deaths and later raised that estimate to 1.7 million, more than 20 percent of the population. His deputy, Craig Etcheson, undertook the most complete survey of mass graves and evidence of executions in Cambodia and concluded in 1999 that the Khmer Rouge may have executed as many as 1.5 million people and as many as another 1.5 million may have died of starvation and overwork. Kiernan criticized Etcheson for "sloppiness, exaggerating a horrific death toll", and "ethnic auctioneering". Etcheson's report was removed from the web site of the Cambodian Genocide Project.