Grassroots activists, beware. Your town or county may at this very moment be falling prey to a stealth attack by the Israel lobby. You may awake tomorrow to find that your local government has signed on to an expanded definition of antisemitism that makes it antisemitic to criticize Israel or Zionism. In late July, Montgomery County, Maryland, narrowly avoided exactly that fate, while neighboring Arlington County did not – and no one knew what was coming. On July 23, the American Arab Anti-Discrimination Committee (ADC) sent out an urgent action alert to Montgomery County residents warning that in three days...