More backstory of the real MS-13
The Mara Salvatrucha gang originated in Los Angeles, set up in the 1980s by Salvadoran immigrants in the city's Pico-Union neighborhood who immigrated to the United States after the Central American civil wars of the 1980s.
Originally, the gang's main purpose was to protect Salvadoran immigrants from other, more established gangs of Los Angeles, who were predominantly composed of Mexicans and African-Americans.
Many Mara Salvatrucha gang members from the Los Angeles area have been deported after being arrested. Namely, Jose Abrego, a high-ranking member, was deported four times. As a result of these deportations, members of MS have recruited more members in their home countries. The Los Angeles Times contends that deportation policies have contributed to the size and influence of the gang both in the United States and in Central America. According to the 2009 National Gang Threat Assessment, "The gang is estimated to have 30,000 to 50,000 members and associate members worldwide, 8,000 to 10,000 of whom reside in the United States."