Antisemitic protesters who shouted at theatergoers attending the Broadway revival of a musical about a Jewish man wrongfully accused of raping and killing a girl drew immediate criticism this week from the show’s producers and star Ben Platt. Platt plays Leo Frank, a pencil factory worker who was charged with raping and murdering a 13-year-old girl in 1913 in Georgia. He was convicted of murder and sentenced to life in prison. In 1915, a mob dragged him from his prison cell and lynched him. About six members of the National Socialist Movement, which activist groups classify as a neo-Nazi organization,...