The government’s key witness when prosecuting Brian E. Moore for allegedly threatening to shoot an assistant attorney general was John Harvey, an attorney who had been appointed to defend Moore during criminal contempt proceedings in the District of Columbia.Moore was initially accused of violating an order that prohibited him from contacting his then-wife. The bench trial was stretched out so he could get training in North Carolina to become a crane operator.During a jury trial in the second case, Harvey testified “about …