After the National Rifle Association refused to rescind a fundraising letter sent out before the Oklahoma City bombing thatt called federal agents “jack-booted thugs,” former president George H. W. Bush resigned from the group. In his resignation letter, Bush said he had known an ATF agent killed in Waco and a secret service agent killed in Oklahoma City. “To attack Secret Service agents or A.T.F. people or any government law enforcement people as ‘wearing Nazi