Adolf Hitler systematically killed an estimated six million Jews and launched wars that killed an estimated 60 million.
Mao Zedong's Great Leap Forward from 1958 to 1961 may have killed as many as 55 million through a resulting famine.
Former Soviet leader Josef Stalin caused the deaths of more than five million people in Ukraine after collectivizing agriculture.
But the organizations they headed were still not as dangerous as the U.S. Republican Party, according to U.S. linguist Noam Chomsky.
In fact, he calls the Republicans "the most dangerous organization in world history".
In an interview with Truthout, Chomsky also maintained that the Republicans are "dedicated to racing as rapidly as possible to destruction of organized human life".
"There is no historical precedent for such a stand," Chomsky said.
It's because of the Republicans' denial that rising greenhouse gas emissions are destabilizing the climate. And that will lead to severe hardship in countries like heavily populated Bangladesh.
Chomsky also pointed out that U.S. Election Day coincided with the World Meteorological Organization releasing a report, which pointed out that the past five years were the hottest in recorded history.