Johnny Matassa Sr. was Sinatra's Bodyguard when he came into Chicago. My view is that Frank hated Johnny bc he was essentially Giacancana's hall monitor - Sinatra couldn't move in Chicago without Giancana (through Matassa) telling him he could - Matassa would also force Sinatra to go around to all the private homes of the top guys for private performances. Sinatra was like a whore and Matassa was the pimp working for Giancana.

I really think Giancana was one of these guys who would fuck with Sinatra and treat him like dog shit just to do it and show his power over a hollywood golden boy - he was that type of guy.