Zack Polanski wants to become the next MP for Holborn and St Pancras and if that doesn’t set major alarm bells ringing then you haven’t been paying attention. You mustn’t dismiss this as political theatre, or assume Labour will deal with him, or convince yourself that because Polanski is already leader of the Green Party, becoming one MP among 650 would make little difference. But above all, do not leave it to somebody else. Britain has seen this movie before and so has specifically British Jewry, by which, for the purposes of this piece, I mean those of us who believe in the right of the Jewish people to self-determination and the continued existence of a Jewish state, Zionists. We have seen what happens when a political movement begins treating Zionism as though it were simply another political ideology, something Jews can reasonably be expected to discard, denounce or cleanse themselves of. It is nothing of the sort. The word Zionism may be modern, the...