. >> the streets of ferguson areo. quiet, but the city remains on edge. demonstrations marking the anniversary of michael brown's death descended into violence including the shooting by police of 18-year-old tyrone harris who remains in critical condition. adding to the tension is a handful of heavily armed men patrolling the streets. drawing criticism from protesters and police. the men are members of a group called oath keepers. they say they are in ferguson to defend the constitution and protect businesses. composed of ex-military and police officers, they claim to have up to 30,000 members nationwide. they are part of a small but vocal group that is antiestablishment and very progun. while many would like to dismiss them as fringe, they are catered to by mainstream politicians like never before. >> reporter: cj is not just any gun owner. when i met him at a range just outside of austin, texas, he had six guns on him and made sure to let me know he's prepared for anything. >> if there is a breakdown of society, all the food in the world isn't going to