Bluestockings was Mr. Bray’s first appearance on a 35-stop tour to promote Antifa: The Anti-Fascist Handbook (Melville House), a book he’d never planned to write. He had researched turn-of-the-century Spanish radicalism as a doctoral student at Rutgers University at New Brunswick, and seemed well on his way to a life of teaching undergraduates and writing about modern European history. Then Donald Trump won the presidency, white nationalists rejoiced, and 20th-century European fascism was suddenly on everyone’s mind.