safety. for our safety, you know. watching your back. you never know what can happen, you know. things happen. >> this is prison and things can happen here. >> it's good having somebody else with you. they've got your back or whatever. you know? >> right now, the atmosphere seems calm and uneventful. but, in fact, each gang is involved in at least some level of surveillance activity. >> over in the corner, you see where the aces are sitting. you'll see that everybody is sitting, facing a different direction. the reason for that is, that they're making sure nobody comes to their area. and if you look, you'll see their area is all empty right around them because they control that area. and they're not going to let anybody take their space. this is a turf war here. with the northern hispanics, they have a minister of defense, is what they call him. and his thing is he's to have ten weapons ready at any time. their weapons are all hid over there. and in the morning we'll come over and we'll search that area and try to find their weapons.