On top of my head, maybe cambodia in the 70's https://en.wikipedia.org/wiki/Khmer_Rouge The Khmer Rouge regime was highly autocratic, totalitarian, xenophobic, paranoid, and repressive. Many deaths resulted from the regime's social engineering policies and the "Maha Lout Ploh", an imitation of China's Great Leap Forward which caused the Great Chinese Famine.[7]:[12][13] The Khmer Rouge's attempts at agricultural reform through collectivisation similarly led to widespread famine, while its insistence on absolute self-sufficiency even in the supply of medicine led to the death of many thousands from treatable diseases such as malaria. The Khmer Rouge regime murdered hundreds of thousands of their perceived political opponents, and its racist emphasis on national purity resulted in the genocide of Cambodian minorities. Arbitrary executions and torture were carried out by its cadres against perceived subversive elements, or during genocidal purges of its own ranks between 1975 and 1978.[14] Ultimately, the Cambodian genocide led to the death of 1.5 to 2 million people, **around 25% of Cambodia's population.** In the 1970s, the Khmer Rouge were largely supported and funded by the CPC, receiving approval from Mao Zedong; it is estimated that at least 90% of the foreign aid which was provided to the Khmer Rouge came from China.[7]:[8][11][15][16][17]:[18] The regime was removed from power in 1979 when Vietnam invaded Cambodia and quickly destroyed most of the Khmer Rouge's forces. The Khmer Rouge then fled to Thailand, whose government saw them as a buffer force against the communist Vietnamese. The Khmer Rouge continued to fight against the Vietnamese and the government of the new People's Republic of Kampuchea until the end of the war in 1989. The Cambodian governments-in-exile (including the Khmer Rouge) held onto Cambodia's United Nations seat (with considerable international support) until 1993, when the monarchy was restored and the name of the Cambodian state was changed to the Kingdom of Cambodia. A year later, thousands of Khmer Rouge guerrillas surrendered themselves in a government amnesty.