We have seen the graffiti, the tattoos and the headlines documenting their brutality. MS-13 gang known as “La Mara Salvatrucha 13”, is one of the most violently and dangerous gangs in the United States. Chapter eight describes youth gangs as a “social and emotional basis for antisocial activity”. They obtain brotherhood, identity/status and income. In other words the more embedded a boy/man becomes in the gang and its process, the less likely he is to leave. A gang is all about the three hypothesis; selection, facilitation, enhancement and prestige crimes. Gangs work in a co-offending method. The books says “if delinquency is committed in groups, it is because “birds of feather flock together”. When a group is united for good or bad they are