Daniel Johnson: Our subject is the Left and the Jews. A famous phrase from the 19th century—I think it came from the German social democrat August Bebel—was that “anti-Semitism is the socialism of fools”. If that was true then, there are still plenty of these fools around today. Just as in the 19th century, when leading figures of the Left such as Karl Marx set a bad example in their writings about the Jewish people, so today we have a problem on the Left. Where does this come from? Why does it exist?