A national Jewish civil rights group is demanding that the Park Slope Food Coop Board protect Jewish members from “intimidation, retaliation, social targeting, and coercive pressure” ahead of a vote on a proposed boycott of Israeli products. The appeal, in a Wednesday letter from the Brandeis Center, comes after weeks of escalating conflict inside the socialist-leaning Brooklyn market, including a general meeting at which an attendee declared that “Jewish supremacism is a problem in this country,” drawing applause from dozens of other members. “Jewish people should not have to choose between local and organic food and their safety and their voice,”...