"By the authority vested in me as President by the Constitution and laws of the United States of America, including section 505 of the International Security and Development Cooperation Act of 1985 (22 U.S.C. 2349aa-9), and section 301 of Title 3 of the United States Code, I, RONALD REAGAN, President of the United States of America, find that the Government of Iran is actively supporting terrorism as an instrument of state policy. In addition, Iran has conducted aggressive and unlawful military action against U.S.-flag vessels and merchant vessels of other non-belligerent nations engaged in lawful and peaceful commerce in international waters of the Persian Gulf and territorial waters of non-belligerent nations of that region. To ensure that United States imports of Iranian goods and services will not contribute financial support to terrorism or to further aggressive actions against non-belligerent shipping, I hereby order that: Section 1. Except as otherwise provided in regulations issued pursuant to this Order, no goods or services of Iranian origin may be imported into the United States, including its territories and possessions, after the effective date of this Order."
Executive Order 12613; EO 12613
Federal Register: http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR