Members of the group Patriot Front ride the subway as a commuter looks on, in Washington, D.C., on July 4. Cheney Orr/Reuters Cheney Orr/Reuters The sight of hundreds of masked men roaming the streets of Washington, D.C., on July Fourth weekend, wearing khakis, blue shirts and uniform patches, was chilling to some of the city's residents. For many Americans, it was the first they heard about Patriot Front, a white nationalist organization that was born out of the deadly 2017 Unite the Right rally in Charlottesville, Va. A now-viral Reuters photo prompted reflections on the experience of a lone African...