When Jeffrey Herf first learned that America’s largest teachers’ union plans to promote a version of history that erases Jews from the Holocaust story, the news struck him as frightening but hauntingly familiar. Herf has made a career of researching and writing on anti-Jewish sentiment. His most recent book, “Three Faces of Antisemitism,” explores the roots of irrational Jew hatred. ALSO READ | Herf, an emeritus history professor at the , sees the National Education Association’s take on history as echoing the kind of thinking that has helped lay the groundwork for unthinkable mass tragedy — and he believes it’s...