The theater world recoiled Wednesday after neo-Nazis held an antisemitic demonstration outside the first Broadway preview of a revival of “Parade,” a musical about an American Jew who was wrongfully convicted of murder and lynched a century ago. About 12 protesters linked to the National Socialist Movement — a prominent neo-Nazi group with half-century-old roots — took part in the vile Tuesday night demonstration, said Rick Miramontez, a spokesman for the musical. Advertisement In video published on social media, men held up a sign in red ink declaring, “LEO FRANKLY WAS A PEDO,” a reference to Leo Frank, the Georgia...