We’re going to have a little chat,” the plain-clothed officer said to Susan Barney as he fastened handcuffs around her wrists and led her from the cell at the Boston police station, where she was being held with three other political activists. It was January 2009, and they had been arrested after refusing to move from the lobby of the building that houses the Israeli consulate while taking part in a “die-in” to protest Israel’s invasion of Gaza.