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.