The tony, bucolic town of Dublin, Ohio would be one of the last places in America expected to host a convention of white supremacist militiamen. Nestled along the Scioto River, the Columbus suburb’s biggest claim to fame is hosting the PGA’s annual Memorial Golf tournament every summer. But in June 2020, days after the nation was roiled by Black Lives Matter looting and rioting, a man from Wisconsin named Stephen Robeson sponsored a “National Militia Conference” at a Dublin hotel. (Yes, that was the real name of the event.) According to BuzzFeed’s exceptional July 2021 investigative report on the FBI-led...