Laura Poitras and more than 40 other documentarians are calling on the Justice Department to investigate the targeting and harassment of citizen journalists who film police violence. The group includes eight Oscar winners. Laura Poitras won for her documentary about Edward Snowden, “CitizenFour.” The letter, titled “Right to Record,” highlights that the bystanders who filmed the police killings of Alton Sterling, Philando Castile and Eric Garner were all subsequently arrested.