>>6569409 (lb)
Unfortunately, the Logan Act has very few teeth, and the few teeth it has aren't very sharp.
Only 2 indictments have been handed down under it since it's enactment in 1799. And neither of them yielded a conviction.
https://www.law.cornell.edu/uscode/pdf/uscode18/lii_usc_TI_18_PA_I_CH_45_SE_953.pdf
TITLE 18 - CRIMES AND CRIMINAL PROCEDURE
PART I - CRIMES
CHAPTER 45 - FOREIGN RELATIONS
§ 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.