Each gang has its own unique culture - from symbolic colors to body art and hand signs. For members of Bloods-affiliated gangs, the color red has particularly special meaning. The members of MS-13 - ...

A Mara Salvatrucha member shows off the group’s devil horn hand symbol. Getty Images In the US, MS-13 has an especially heavy presence in Los Angeles and San Francisco, Washington D.C., ...

More 100 members of the gang — known as Mara Salvatrucha, or MS-13 — have been arrested in six U.S. cities, and it's believed there are more than 50,000 MS-13 members in the United States alone.