Journalist Michael Edison Hayden spent years tracking extremism in America. His book, "Strange People on the Hill," is about what happened when a far-right group moved its headquarters to a small town in rural West Virginia. We're revisiting our conversation with Hayden, who spoke with Amna Nawaz about the story and what it can teach us about politics in the U.S. right now. Hayden also shared the personal toll this work has taken on his own mental health and  relationships.