>> what's up? you doing all right? i've known his family for some time because we've been in school together from middle school throu high school. by knowing his family, it helped in being able to talk and engage in conversation. >> sergeant kitchings hopes that officer greene's relationship with gathers will provide insight into gathers' role with the game folk notion. >> a set of gangs under a common name, folk nation, black gangster disciples, manic, latin disciples. out of chicago, they fall under the umbrella of folk nation. we have documented cases of a leader of a gang sending out orders to members to assault other inmates. we've had some members get caught up with smuggling contraband to the facility. they have assaulted staff before. so they get -- it can be a real big problem. >> melvin gathers, he is a second lieutenant in folk nation. he is considered one of the higher ranks. when its come down to his gang