Who is the most mass murderer person in the world?

The title of the most prolific mass murderer is often attributed to Mao Zedong, the former leader of China, whose policies and campaigns, particularly during the Great Leap Forward and the Cultural Revolution, resulted in the deaths of tens of millions of people. Estimates of the death toll vary widely, but it is generally believed that his regime caused the deaths of around 40 to 70 million individuals. Other historical figures, such as Joseph Stalin and Adolf Hitler, are also responsible for mass murders on a vast scale, but Mao's impact is considered the most significant in terms of sheer numbers.