Exploring MS-13, “the most violent gang in America,” according to host Lisa Ling. MS-13 is said to operate in 33 states, Canada and Central America, and is involved in drugs, human trafficking and protection rackets. The hour sketches gang operations in Los Angeles and El Salvador, and relates the case of Brenda Paz, a 17-year-old MS-13 informant who was murdered in 2003. “Once you join the gang, you lose all respect for life,” says Ismael Cisneros, who was convicted of killing her.