Location: United States
Scariest fact: They're racist psycho killers.
Murder weapons: Bare hands, shanks, acid baths, and hatred. 

The Aryan Brotherhood is mostly a prison gang, so they aren't a strikingly horrific danger. However, they kill people, kill people, and kill people in jails at an alarming rate. They kill people outside of jails as well, but not nearly as much. The Aryan Brotherhood was founded in 1964 in San Quentin prison near San Francisco. Since 1964 they've earned the distinguishable title of the “most violent extremist group in the US,” by the Anti-Defamation League. Aryan Brethren can be spotted with Nazi and bagpipe tattoos and sometime satanic symbols.