American universities have been under siege by blatantly antisemitic protesters ever since the Oct. 7 Hamas terrorist attack against Israel. These protesters have disrupted learning, assaulted Jewish students, attacked law enforcement and damaged property. This behavior is not protected by the First Amendment; it is hateful law-breaking. University responses have varied, with some canceling or scaling down graduation ceremonies, depriving seniors of this sacred rite of passage after years of study and hundreds of thousands of dollars in tuition. Foreign students involved in such activities — and in even more nefarious ones, like the possible attempted terror attack at Marine...