Most won't refer to the statutory language at 18 USC 953.
Do we have a present "disputes or controversies" with Iran? Probably not, as a legal/technical matter.
As long as the tin foil is free, look at the material support statutes too.
The 1984 Logan Act Conviction vs. the "No indictments in 200 years" falsehood
18 U.S. Code § 953 - Private correspondence with foreign governments
Any citizen of the United States, wherever he may be, who, without authority of the United States, directly or indirectly commences or carries on any correspondence or intercourse with any foreign government or any officer or agent thereof, with intent to influence the measures or conduct of any foreign government or of any officer or agent thereof, in relation to any disputes or controversies with the United States, or to defeat the measures of the United States, shall be fined under this title or imprisoned not more than three years, or both.
This section shall not abridge the right of a citizen to apply, himself or his agent, to any foreign government or the agents thereof for redress of any injury which he may have sustained from such government or any of its agents or subjects.
(June 25, 1948, ch. 645, 62 Stat. 744; Pub. L. 103322, title XXXIII, § 330016(1)(K), Sept. 13, 1994, 108 Stat. 2147.)