You've seen the graffiti, the tattoos, the headlines documenting their brutality. What is driving the rapid spread of the ultra-violent gang Mara Salvatrucha (MS-13)? National Geographic re-investigates MS-13, tracing the evolution and uncovering the truth about this notorious street gang.

A documentary film that highlights two street derived dance styles, Clowning and Krumping, that came out of the low income neighborhoods of L.A.. Director David LaChapelle interviews each dance crew about how their unique dances evolved. A new and positive activity away from the drugs, guns, and gangs that ruled their neighborhood. A raw film about a growing sub-culture movements in America.

About youth gangs on the streets of Kazan.

Documentary about the poet, musician and pioneer of the brazilian punk pioneer  Ariel Ulliana, former 'Inocentes' e vocals on bands 'Restos de Nada' and 'Invasores de Cérebros'

A documentary about the two New York rap artists I.G. Off &amp; Hazadus and their struggle from street to studio to fame. Shot in the years 2000 and 2001

A documentary about German gangs in Kiel in the early 90s.

A documentary about a beloved South Bronx matriarch and former "First Lady" of the Savage Skulls gang struggling to remain visible in a rapidly gentrifying community she helped rebuild in the 1980s. With one foot firmly grounded in the outlaw life and the other as an activist and spiritual advisor, Lorine Padilla straddles the complexities of multiple worlds.

A look at the life and work of a gang reformer.

Kingston, Jamaica. After the controversial extradition of notorious drug lord Dudus Coke to the United States in 2010, chaos took over his former territory, the western neighborhoods of the city, where extremely violent gangs of teenagers kill each other for whatever reason. A group of reformed gangsters from Denham Town decide to mediate.