It means that within the U.S. government there are forces wholly beyond democratic control.
We know 2020 proved it.
LBJ miscalculated, evidence (that Johnson didn't have access to) shows now that JFK was never going to withdraw from SE Asia, so they had to clean up the crime scene by then dumping LBJ and letting Nixon get us out.
Extra-special-crazy-factoid: Bob Schieffer drove Marguerite to see Lee Harvey in the hospital morgue.
The CIA and FBI knew this and were monitoring Oswald. So, yes, both agencies had a role to play but it isn't what Tucker and the Left assert that Oswald was a physically and emotionally weak loner setup to take the fall in a sinister plot by the agencies.
The JFK assassination wasn't that long ago. People Oswald's age at the time are still alive.
Communists are a savage lot who never forget and never forgive.
You can't just go releasing information that would reveal the identities of people involved, their families and friends.
You obviously can't go releasing details of how human intelligence was gathered domestically and abroad either.