Rules for one of the most violent gangs

Former white supremacist TJ Leyden says the Aryan Brotherhood of Texas, which is being eyed in the killing of two prosecutors and the wife of one of the men, is one of the most violent white supremacist groups in the country.

"These are the kind of guys that will stab you and kill you instantaneously and they won't even blink," says Leyden.

He explains to CNN's Wolf Blitzer that if they're behind the murder of Cynthia McLelland, wife of slain Kaufman County District Attorney Mike McLelland, it would be significant.

"There's always been a rule that law enforcement didn't mess with your family outside of you, and you didn't mess with law enforcement's family outside of them personally. But them attacking and killing his wife, that's going to change the scales," he says.