Who was the most nefarious authoritarian leader?

Literally Hitler

Trump. Obviously.

Literally pol
Pot

Ghengis Khan

Frank kush

Karl Marx

Stalin or Mao

Thug Behram deserves at least a mention.

He is the reason the English language now has the word "Thug"

Most think he killed over 900 by garrote alone.

Just adding a new name to the mix other than the modern ones

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The Thuggees had developed their own form of sign language that was referred to as Ramaseena. And, no doubt, that was one of the ways in which they managed to coordinate and operate in such stealth and quiet.

Captain William Sleeman was assigned the responsibility of capturing Behram and investigating Thuggee operations in 1828. It took him over 11 years and nearly cost him his life on 3 separate occasions, before he finally succeeded in capturing a 75-year-old Thug Behram in 1839.

He had captured Behram by first capturing his lieutenant, Syeed Amir Ali – known in the countryside as “Firangha” on account of his looking like a white man – in 1832. Firangha was tortured and eventually persuaded to turn King’s evidence. He took Sleeman to many of the “graves” the Thuggees had used. In all, the British found the skeletons or corpses of around 500,000 people. Firangha then helped the British locate and capture Behram

Unsurprisingly, Thug Behram had been with a woman when Sleeman and his men broke in on him.

While Behram himself maintained that he had throttled 931 people and witnessed the murders of 956 people in all, the British, for some strange and unfathomable reason, spread word that Behram had “only” committed 120–150 murders on his own, and had “merely been present” for 931 murders. He was hanged in private, though his corpse was shown to the public. He was hanged in private in 1839.

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Pol Pot
Not as well known as some, but pretty wicked guy.

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Stalin or Mao

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In modern times, it's Stalin. Mao was incredibly incompetent. He was a true believer in Marxist-Leninism and was hell bent on riding that failed philosophy while millions around him starved. Stalin, on the other hand, was cunning and destroyed anyone that stood in his way.

Both are evil (communism is, in and of itself, is evil) but at different levels.