What after Godfather?

I’m a huge fan of The Godfather (book and movies) and love that Italian-American mafia family vibe, drama, loyalty, and intricate relationships. I also enjoy movies like Donnie Brasco, Casino, A Bronx Tale, Scarface, Goodfellas and Mean Streets for their gritty crime stories and family dynamics. What books would you recommend to keep that vibe going? Is The Sicilian a good next read, or are there other novels that capture the same mafia intrigue and heart? Bonus points for anything with that intense family loyalty feel