EXCLUSIVE: Emmy winners Julianna Margulies and Sarah Silverman are lending their star power to support the Oscar-contending short documentary Jack and Sam, the extraordinary story of two Holocaust survivors reunited nearly 80 years after they escaped death in a Nazi labor camp. Margulies, Silverman and Amy Zvi (Sarah Silverman: We Are Miracles) have signed on as executive producers of the film directed by Emmy Award-winning filmmaker Jordan Matthew Horowitz. Jack and Sam premiered in June at the Provincetown International Film Festival, going on to win the Jury and Audience Awards for Best Documentary Short at the Port Townsend Film Festival...