Four years after far-right demonstrators came to Charlottesville, Va., victims of the mayhem are suing the rally’s organizers. At the core of their federal lawsuit is the 19th-century KKK Act — and thousands of texts and social media posts shared on the dark web. This month two media experts joined us for a conversation about the trial, taped live just a mile from the courthouse where jurors are weighing the facts. Here’s an edited version of that show, the first in our series on democracy “hot spots.”