In gangs, fear and any sign of it is often manipulated or formed into somethign else as a defensive tactic for an individual. To start off, gangs try to use brute force and violence to scare someone. The fear drives a person, usually, into a defensive state which can either make them want to become stronger or obey to avoid getting hurt. Gangs manipulate that and the victim follows order they would not naturally do unless they are driven into a corner. This is intimidation, the feeling of overwhelming power forced upon someone else manages them like puppets into doing thing. The victims follows obediently but sometimes unwillingly. After a certain amount of time the orders are automatic, a part of their life that they can't shun out, for fear of the consequences once they disobey. Intimidation works if the victim really has no power or control over anything to give them a hold onto how they can overwhelm the other party or if the victim is themself overwhelmed by the power displayed by the gang that they feel as if they have no place to live safely.
Another way fear forms is that a victim, maybe targeted for manipulation, refuses to let themselves be overtaken and thus tries to become more powerful themselves. Also, if the victim feel fear, they might substitute that fear for anger and use it physically. In a gang, a member, or a head, identifies a threat and, through fear, they want to obliterate it. They use the anger to fuel them, or drive them into ridding the threat, usually terminal, so they don't have to face the consequences that could eventually hurt them. In the end, even if they are pushed into a corner, say by the authorities, the remain dominant in the place that they are located to establish roles. They do this so the surrounding people know that person's place and not to mess with him.
