The Knights Templar from the Assassin's Creed series.
The organization that nearly everyone is familiar with, regardless of whether or not one's played Assassin's Creed. The game series sheds new light on the group that we all thought before to be benevolent, saying that, to have a perfect world, they would enslave the entire population with divine magic and have been trying to do so since the creation of Adam and Eve. Their leaders throughout the game series: Robert de Sable, Rodrigo Borgia, Cesare Borgia, and all of the abhorrent deeds commited by their innumerable conspirators, make them the most chilling video game villains I have ever encountered.
The game even lists famous historical figures as members of the Templar order: Grigori Rasputin, Henry Ford, even Thomas Edison. Those whom we thought to be great minds and benevolent figures of world history are suddenly warped and twisted into what we know to be Templars by playing the Assassin's Creed series: Cruel, heinous men and women with a ravenous hunger for world domination.
It's not like any of this is real, anyway. So there's nothing to worry about.
