If you want to understand why anti-Semitism seems to be increasing among young people—especially young people on the hard left—consider a recent invitation extended by a left leaning school in New York to a self-proclaimed Jew hater. The Friends Schools around the country are legendary. Presidents’ children attend them, my own daughter and nephew were students, and they are regarded as among the most elite schools in the world. That is why it is so shocking that the Friends Seminary in New York has lent its imprimatur to a notorious anti-Semite and Holocaust denier. Friends Seminary has a reputation for...