Note: article mentions a series of Hispanic gangs being active in the military, then closes with pseudo-skinhead T.J. Leyden describing a mythical skinhead problem. No, it's not biased (against reality) honest!
Actually, MS13 is most prevalent in Central America. They are the controlling gang in El Salvador, for example. They come up to the US on a work permit mostly on the West Coast; LA mostly. They get in trouble, go to jail. The jail system is like their boot camp. They learn the gang trade in prison then go back to El Salvador to reign hell down there. San Salvador is mostly where they work out of and we were almost 2 hours from there.
