I think both the mafia and street gangs are important social problems, even though street gangs are less powerful, they are more violent. I mean, the mafia is nowadays more into financial crimes and rarely shoots, while for street gangs violence is the preferred method of solving problems. If the mafia wanted, they would probably have the power to wipe street gangs out, no doubt that they are on upper places in the hierarchy of the criminal world, but I think that to protect common people, fighting street gangs is even more of a priority than fighting the mafia. A random person has many more chances of being shot by a street gangster that felt "disrespected" by a casual glance in his direction than being struck by a mafia bullet.