The Deadliest World Leaders In Modern History

History has a way of repeating itself — even the really bad parts. One thing we see happen over and over is the rise and fall of evil men who are willing to commit atrocities in order to gain and maintain power. As soon as one is toppled or chased off into exile, another crawls out of the ooze and gets to work. But who are the worst of the worst? How and why did they get that way? These are the deadliest world leaders in modern history.