Former CIA agent Joseph Fernandez, accused of unlawfully organizing the resupply of Nicaraguan rebels, pleaded not guilty Tuesday to charges of conspiracy and obstruction of justice in the Iran-Contra case. Accompanied by his lawyer, Thomas Wilson, Fernandez stood before U.S. District Court Judge Aubrey Robinson to enter his plea in federal court, telling the judge, "Your honor, I plead not guilty." Fernandez, who used the alias Tomas Castillo, was the first CIA official to be charged.