While playing a game, press Black(3), A, White, L, Black, L, Down, A. A note will confirm that you entered the code correctly. Lock on to someone (any pedestrian or even rival gang members) and press Up on the D-pad to recruit them. They can do everything that your Grove Street Family members can do. Each person you recruit will get a rocket launcher unless they already have a gun. Also, you may first need to enable the "Recruit anyone into your gang with guns" code. Repeat this code to disable its effect.