Neo-Nazi marches. Horrific mass murders. Widespread racist rhetoric. Dangerous white nationalism is on the rise across America – including in its prisons. This chilling documentary examines the threat posed by white supremacists in the US, and asks: what lies behind farright violence? Follow an investigation deep into the US penal system, where racist gangs recruit new members and order terrifying initiation killings. Meet the people affected by their violence. And hear from the people trying to bring them to justice. This is a stark look at racial hatred in an increasingly divided United States.