This one seems interesting, though I don't see any connection to the assassination.
It describes an agent, AMCARBON-1, who remained an agent during a career in journalism. It describes a couple of news stories that were apparently cultivated under the supervision of the CIA, including one about a stolen shrimp boat.
Is this perhaps one of many similar documents describing what came to be known as Operation Mockingbird?
Found a possibly interesting one, either because it's not clear why it was ever classified, or perhaps because it has some previously undisclosed diplomatic procedures.
It describes the 201 dossier system, and circumstances under which one is automatically opened, categorized by known persons of various other regions and states.
You're referring to this document [1] which has been declassified in 2017 [2] but this 2025 release comes up with some redaction removed - but essentially not providing more information. There's nothing interesting. The document opens up with a quote from a magazine (which people are mistaking for a statement of a document itself) and then goes over into detail of the work that guy has been doing - which is pretty mild. The whole document seems to fact-check the quoted magazine.
Looking by hand, starting with record 1, this is the first record that seems at all interesting to me. Some guy named Sergyj Czornonoh claims to have provided informatino about Oswald's involvement in a right-wing plot to assassinate JFK and MLK as early as August 1963.
The guy sounds deranged / paranoid, but he does give the names of the people he purported to meet, including at least one who was a real director at State. I'm not sure how easy that was to ascertain in that year.
Probably nothing, but I'll keep reading for a bit.
2023 release: https://www.archives.gov/files/research/jfk/releases/2023/20...
2025 release: https://www.archives.gov/files/research/jfk/releases/2025/03...