Contra funding via Iran arms sales defied Congress and drug law

Evidence

In the United States, the Contras eventually became part of the biggest presidential scandal since Nixon when reporters and Congress revealed that the Reagan administration had covertly sent money and weapons to the Contras by using proceeds from secret sales of weaponry to Iran. The revelations were triply shocking: the United States had officially condemned Iran as a sponsor of international terrorism; Congress had explicitly prohibited funding the Contras; and Congress’s Iran-Contra hearings confirmed that the CIA had known since at least 1984 that the Contras were trafficking drugs into the United States. — David Vine, Base Nation_ How U.S. Military Bases…, 290