The FARA act covers a person who “solicits, collects, disburses, or dispenses contributions, loans, money, or other things of value within the United States” while acting in the interests of a “foreign government, a foreign political party, any person outside the United States ... and any entity organized under the laws of a foreign country or having its principal place of business in a foreign country.”
But an individual person is not a foreign entity, especially not if they are a US citizen.
There is the loophole for "representing interests of a foreign principal before US government officials" though, so I guess this is written broadly enough to snag anyone who may step on some toes.
Please don't cross into personal attack. If another commenter is confused, or you feel they are, it's enough to supply correct information in a helpful spirit. Alternatively, it's always fine not to post.