Actually, the DoJ has a FAQ: What is an “agent of a foreign principal”? An “agent of a foreign principal” is any person who acts as an agent, representative,

Actually, the DoJ has a FAQ: What is an “agent of a foreign principal”? An “agent of a foreign principal” is any person who acts as an agent, representative, employee, or servant, or otherwise acts at the order, request, or under the direction or control of a “foreign principal” and does any of the following: Engages within the United States in political activities, such as intending to influence any U.S. Government official or the American public regarding U.S. domestic or foreign policy or the political or public interests of a foreign government or foreign political party. Acts within the United States as a public relations counsel, publicity agent, information service employee, or political consultant. Solicits, collects, disburses, or dispenses contributions, loans, money, or other things of value within the United States. Represents within the United States the interests of a foreign principal before U.S. Government officials or agencies. See 22 U.S.C. § 611(c); 28 C.F.R. § 5.100.