NEW YORK—A New York food delivery worker charged with threatening past and present political figures and Fox News personalities was ordered held without bail Friday after a prosecutor cited the man’s criminal history and his “direct and unambiguous” threats. Assistant U.S. Attorney Patrick Moroney said Rickey Johnson, 47, also known as Nigel Dawn Defarren, made multiple death threats in the past two weeks in videos online, including telling a congresswoman: “Ma’am, you are dead. You will be killed. Smile. I’m going to kill you.” Manhattan U.S. Attorney Audrey Strauss said Johnson threatened to kill several cable news broadcasters, current, and former U.S. senators and members of the House “in rage-fueled posts on Instagram and in chilling private messages.” The targets of the threats were not identified in court papers. Moroney told U.S. Magistrate Judge Gabriel W. Gorenstein that Johnson, arrested Thursday night, told a broadcaster: “I’m going to take your …