A document published on the website of the Mexican Instituto Nacional de Migración (National Institute of Migration) in July 2013 detailing Latino gang tattoos.
Historically, Hispanic gangs north of the dividing line have claimed allegiance to the Nortenos and those to the south claimed allegiance to the Surenos. All California Hispanic criminal street gangs claim allegiance to the Nortenos or Surenos, with the exception of the Fresno Bulldogs. Whether it’s on the streets or in the correctional facilities, the Fresno Bulldogs function independently and do not align themselves with Nortenos or Surenos. The Fresno Bulldogs are a unique California based gang that has the power, strength and a large enough membership to stand on its own and remain free from the politics of the Nortenos and Surenos. All other Hispanic criminal street gangs are forced to choose a side whether they want to join in or not.