As Mayor Zohran Mamdani lets loose the dogs of antisemitism, will anyone stop him? Last week brought two reasons for hope, and two fronts to watch. The City Council passed Speaker Julie Menin’s bill creating “buffer zones” to rein in protests outside houses of worship — over the opposition of Mamdani’s closest allies, and by a veto-proof majority. The bill protects the rights of all faiths, but was plainly inspired by last November’s mob siege of Manhattan’s Park East Synagogue, when 200 goons harassed people trying to attend an event by Nefesh B’nefesh, a Zionist group that helps Jews immigrate...