13. Thuggee of India
Apparently based in South India, this secretive group of thieves and assassins were last documented in the early 1800s. What was interesting was the way they would leave their signature when committing crimes, which was the creative usage of a kerchief as a noose to strangle and kill victims before emptying them of their valuables. Unlike a lot of secret societies, the Thuggee almost exclusively initiated from the criminal underclass, rather than among the rich and prosperous.