A British Muslim politician is on the receiving end of things after she told her social media followers that she would never support Labour leader Ed Miliband because he is “a Jew.” A few years ago, something like this quite simply could not have happened. That was back when anti-Semites understood that society didn’t want to have anything to do with them. So what did they do? They hid, pretending they were open-minded and tolerant. In the last couple of years, however, everything has changed — in Europe, at least. Now, European anti-Semites — most of them Muslim immigrants or...