At a Hanukkah celebration last month, President Biden stated: “Today we must all say clearly and forcefully: Anti-Semitism and all forms of hate and violence in this country have no safe harbor in America.” But simply saying it, no matter how forcefully, does not appear to carry much weight against the increasingly evident support among many black Americans for ideas and voices espousing violence toward Jews. Black and Hispanic youth report higher rates of anti-Semitic views than among white youth on the alt-right. Unfortunately, much of the pushback so far treats the problem of anti-Semitism like an issue for classroom...