Criminal tattoo - Wikipedia

Criminal tattoos are a type of tattoos associated with criminals to show gang membership [better source needed] and record the wearer's personal history—such as their skills, specialties, accomplishments, incarceration, world view and/or means of personal expression. [citation needed] Tattoos are strongly empirically associated with deviance, personality disorders, and criminality.

Mexican Mafia - Wikipedia

The Mexican Mafia (Spanish: Mafia Mexicana), also known as La Eme (Spanish for "the M"), is a highly organized Mexican American criminal organization in the United States. Despite its name, the Mexican Mafia did not originate in Mexico, and is entirely a U.S. criminal prison organization. Sureño gangs use the number 13 to show allegiance to the Mexican Mafia, as M is the 13th letter of the