Are you saying that Sinatra had a connection with the JFK assassination?
No No only that Sinatra was a key link to both upper and underworld.
Knowing people from all walks of life does not make him a go between for them.
True but Frank was powerful and there was an atmosphere of intimidation that surrounded Sinatra. His code name within the CIA I believe was Napoleon.
BTW Martin Scorsese still want to revive Frank Sinatra biopic with Leonardo DiCaprio that would be cool.