Amends the Foreign Agents Registration Act of 1938 to prohibit any person from acting as an agent of a foreign principal that is: (1) the government of a foreign country that the Secretary of State has determined to have repeatedly provided support for acts of international terrorism; (2) a foreign political party of such a government; or (3) a partnership, association, or other combination of persons organized under the laws of or having its principal place of business in a foreign country of such a government.