Who comes to mind as the biggest mass murderer in history?

I am curious who comes to mind first. Without looking it up guess.

Hitler
Stalin
Mao
Trump
Other - please specify
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Just a FYI I put Trump in as a joke. So far three people are either voting to go along with the joke OR they really believe Trump is a mass murderer.

I would like to believe the former but I’ve seen so much leftist stupidity over the last years it’s likely the latter.

I will say I’m surprised more people didn’t vote for Hitler. The whole world (rightfully) knows about the Nazi Holocaust. But fewer people know about China’s Great Leap Forward and/or Holodomor.
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Also I should of titled this as “Mass Murders committed under Modern Dictators”.

Genghis Kahn killed at least 40 million people. But that was a much different comparison. He was more about conquest. This is about regimes.
Who comes to mind as the biggest mass murderer in history?
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