It’s time for Zack Polanski to make a stand against the antisemitism rippling through his Green Party. Not only is it the right thing to do, it’s also now costing him support. The Greens recently won the Parliamentary seat of Gorton and Denton with a heavy focus on Gaza, a trend that they’ve carried into these local council elections. In doing so they’ve attracted some of the same obsessional anti-Zionists who flourished under Jeremy Corbyn’s Labour leadership and who Sir Keir Starmer was forced to expel. The core tension within the Greens is between robust criticism of Israeli policy, which...