For decades, Joe Biden has proudly declared that he is a Zionist, and he has repeated that claim since Hamas’s 7 October attacks on Israel. But for the student anti-war protests gripping the US, the words “Zionist” and “Zionism” have become a watchword – pejorative and emblematic of the violent state policies driving the war on Gaza. On social media and in the streets, critics no longer call out supporters of the state of Israel as “pro-Israel”: they call them Zionist. Some university encampments have posted signs saying: “Zionists not allowed.” Student protesters say that their criticisms of Zionism are...