While Jews experience antisemitism as its targets, Catholics in solidarity are called to recognize and oppose it vigorously: "mindful of [her] common inheritance with the Jews... [the Church] deplores ...persecutions and demonstrations of antisemitism directed at Jews at whatever time and by whomsoever." Vatican II, Nostra Aetate 4 (1965). Today, does the widespread discourse of "antizionism" mask antisemitism under another name? The sociologist Shaul Kelner explores the ideological roots and social structure of America's "antizionist" movement to uncover the answer.