In recent years MS-13 has become one of the most feared street gangs in the world, thanks to face tattoos and machetes. Underworld host and producer Danny Gold first went to El Salvador to report on the gang and their rivals 18th Street in 2015 and has since returned numerous times. In this episode he breaks down the origins of the gang and what it's like to go behind the scenes with them (and 18th street).

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