Anthony Devlin/PA Wire/via AP Images Former mayor of London Ken Livingstone is surrounded media outside Millbank in Westminster, London, on April 28, 2016, as Jeremy Corbyn is facing intense pressure to suspend his close ally after he defended the actions of an MP suspended over an anti-Semitism row. K en Livingstone, formerly mayor of London, presently a member in very bad standing of the British Labour Party, can be thanked for this much: He has provided a painful moment of clarity in the debate over whether anti-Zionism is, at least sometimes, anti-Semitism. The answer is yes. For instance, when one says that when Hitler came to power “in 1932 [sic], he was supporting Zionism,” as Livingston recently did , or when one says that not hating all Jews, just Jews in Israel, is not an anti-Semite, as he subsequently did . This bears explanation. But first comes some context, and dispensing with certain reflexive objections. So let's start here: Last week, Labour leader Jeremy Corbyn...