Photographer Adam Hinton has taken a series of mesmerizing portraits of members of the Mara Salvaruch, also known as MS-13 — one of the most violent criminal gangs in North and South America. These photos were taken in a Salvadoran prison.
MS-13 members come from the poorest and most marginalized segments of El Salvador's society. All of them are covered with tattoos. The prison, which holds about 2,600 prisoners, is designed to accommodate only 800 people. It is guarded by the army.