Antisemitism took a frightening turn Monday at the University of California, Berkeley, where a pro-Palestinian mob surrounded a campus auditorium, broke a window, and harassed Jewish students trying to enter the building. Israeli lawyer Ran Bar-Yoshafat was invited by a Jewish student group to address the subject of Israel and international law. This included “the rules of wartime conduct and how the [Israel Defense Forces] can better protect civilians,” according to an Instagram post by Students Supporting Israel at Berkeley. But the speech never happened, as besieged Jewish students gathered inside a nearly empty auditorium in Zellerbach Playhouse while some...