https://www.archives.gov/files/research/jfk/releases/docid-32144493.pdf
The full details are on the 3rd page, and asserts that both Oswald and Jack Ruby had connections to Communism, and that the only two factions that were aware of the path the President's motorcade would take through Dallas were the Secret Service, and the Dallas PD, the latter of which Ruby had possibly infiltrated.
It's like something that was written by a conspiracy nut, but there it is.
The full details are on the 3rd page, and asserts that both Oswald and Jack Ruby had connections to Communism, and that the only two factions that were aware of the path the President's motorcade would take through Dallas were the Secret Service, and the Dallas PD, the latter of which Ruby had possibly infiltrated.
It's like something that was written by a conspiracy nut, but there it is.