It is certainly true that anti-Zionism and antisemitism are conceptually distinct phenomena, but that does not mean they are unrelated in reality. There has always been an undercurrent of anti-Jewish bigotry in much criticism of Israel. Sometimes, only a dramatic revelation can uncover a connection.

Consider the case of Haverford College, in suburban Philadelphia, where Jewish students, with ties of religion and shared ancestry to Israel, had complained of intimidation from classmates, administrators and faculty. The college administration insisted that the alleged harassment was not based on Jewish identity, but rather on “specific political views and positions on world events, namely, the Israel-Palestine conflict.”

Then a tenured Haverford faculty member was arrested by the FBI for repeatedly sending menacing messages to a Jewish colleague, with hate-filled slurs and embedded threats of violence.…