we know they're from 25th and mallard. >> what you have is the kings from 25th street.n 31st treat now. they've made it down six blocks to say this is their neighborhood too. this was done last night. obviously i didn't see it yesterday. we both travel there is route in and out to work. this is definitely done yesterday. >> as gangs expand their operations and grow increasingly brazen, investigators must continually broaden their own network of informants to outmaneuver them. >> cases don't fall in your lap. you have to go out and talk to people. you might do 25 cold interviews get one half decent lead out of that. can't let it discourage you. you go weeks with nothing. one day your phone will ring, you have the biggest case of your career popping up. >> when the squeeze returns -- >> going straight. he's right. >> ciu informant delivers a big payday. a down every block, or a "hugh and crye" in every town. these are the small businesses of america, and all across the nation they're getting ready for their day. hundreds of thousands of small businesses are preparing for