That would be the one perpetrated by the Communist dictator of China, Mao Zedong:
https://www.washingtonpost.com/news/vol ... r-his-due/
"Remembering the biggest mass murder in the history of the world"
"Who was the biggest mass murderer in the history of the world? Most people probably assume that the answer is Adolf Hitler, architect of the Holocaust. Others might guess Soviet dictator Joseph Stalin, who may indeed have managed to kill even more innocent people than Hitler did, many of them as part of a terror famine that likely took more lives than the Holocaust. But both Hitler and Stalin were outdone by Mao Zedong. From 1958 to 1962, his Great Leap Forward policy led to the deaths of up to 45 million people – easily making it the biggest episode of mass murder ever recorded...."
"While the horrors of the Great Leap Forward are well known to experts on communism and Chinese history, they are rarely remembered by ordinary people outside China, and has had only a modest cultural impact.... What accounts for this neglect? One possible answer is that the most of the victims were Chinese peasants – people who are culturally and socially distant from the Western intellectuals and media figures who have the greatest influence over our historical consciousness and popular culture. As a general rule, it is easier to empathize with victims who seem similar to ourselves."
"But an even bigger factor in our relative neglect of the Great Leap Forward is that it is part of the general tendency to downplay crimes committed by communist regimes, as opposed to right-wing authoritarians. Unlike in the days of Mao, today very few western intellectuals actually sympathize with communism. But many are reluctant to fully accept what a great evil it was, fearful – perhaps – that other left-wing causes might be tainted by association."
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There Are Four Lights!