When hundreds of white supremacists arrived in Charlottesville, Virginia, for a deadly “Unite the Right” protest last August, local authorities were unprepared for the violence that terrorized the city, largely standing back during bloody encounters between white supremacists and counterprotesters. One year later, we speak with investigative reporter A.C. Thompson on his work to track down and identify white supremacists from Charlottesville and other extremist rallies across the country. His investigation, “Documenting Hate: Charlottesville,” premieres tonight at 10 p.m. Eastern on PBS.

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