 There is also evidence that the Dallas Police Department withheld relevant information from the Warren Commission concerning Ruby's entry to the scene of the Oswald transfer.According to Lieutenant Billy Grammer, a dispatcher for the Dallas Police Department, he received an anonymous phone call at 3 a.m. on November 24 from a man who knew Grammer's name.The caller told Grammer that he knew of the plan to move Oswald from the basement and that unless the plans for Oswald's transfer were changed, the caller warned "we are going to kill him".