LOS ANGELES — Herlyn Barrientos wasn’t happy to run into a fellow member of his gang in the produce section of his local grocery store.
A burly man with tattoos inked on his head and face, Barrientos was from MS-13, a group notorious for savage killings. Federal prosecutors alleged the Honduran national, nicknamed “Doctorazo,” supplied methamphetamine to MS-13 members across Los Angeles, who sold the drug and kicked up a cut to the gang’s imprisoned leader.
Charged with drug trafficking in 2023, Barrientos decided to turn on his gang and cooperate with the FBI. A judge signed off on his release from jail, and Barrientos, 47, returned to South Los Angeles…