The Logan Act has been in force since 1799, and is still in effect; after all, as our esteemed border czar Tom “The Hammer” Homan points out, the Constitution is even older, and we still (well, most of us) abide by that. Since 1799, only two people have been charged under the Logan Act: In 1802, a Kentucky farmer, Francis Flournoy, was charged for advocating for a new western state, not affiliated with the United States but allied with France. Then, in 1852, a sailor named Jonas Phillips Levy corresponded with the government of Mexico, opposing an American negotiation with Mexico over a railway.
There are a lot more details surrounding both of those cases, but those are the broad strokes. Neither man was convicted, and enforcement of the Jones Act kind of faded away. No American has been charged under the Jones Act since 1852.
Now, though, it may be…
