puzo never knew Sinatra oak. but it was widely known in and around Hollywood that Sinatra had the backing of the mob, Sinatra was as most will tell you was a punk-ass bully and was very well not only disliked, but hated.
without the mob Sinatra could not even have a job.
" watch what you say around this guy, he's got a big mouth" sam giancana to an outfit soldier about frank Sinatra. [ from the book "my way"