I compared the four bloodiest dictators in world history who are estimated to together have caused the death of 160 million people (source: R.J. Rummel). They all date back to the 20th century except for Kublai Khan (13th cent.).
Scale is based on the average worldwide traffic of mao in all years
It is amazing how much Hitler still personifies this dubious category even though Mao and Stalin are estimated to have sent respectively four and two times as many people to an early grave. Note the dip in the trend lines around Christmas each year.