It’s true that this is not the anti-Semitism of the 1930s, which came from the right and was rooted in longstanding Christian views that demonized the Jews. Traditionally, Islam did not treat Jews this way. But in the past century a distinct strain of Muslim anti-Semitism has emerged. Built on a foundation of antipathy toward non-Muslims, it mixes Christian anti-Semitism — imported to the Middle East by European missionaries — and a more leftist, secular form of anti-Semitism. It is evident in political cartoons, editorials, television shows and newspaper articles.