I loved the Godfather films. Al Pacino helped. They're very sentimental though. Vito Corleone's a nice chap who's just trying to do right by his family
But then again Nucky's a nice person, mostly.
There was quite an interesting detail in Boardwalk where Nucky insisted with Narcisse that the heroin trade will be confined to black people. And Gillian goes into the black barber's to buy it. Vito Corleone does the same thing, but it's the '40s, not the '20s.
I know the Vito character was based on at least three gangsters - Charlie Luciano, someone called Frank Costello and someone else I forget and it could be the person Nucky is based on. I wondered whether that was a specific reference or just a common prejudice.
I realise I'm coming over as a nerd here 
For my project I even did an illustration on the front of a foaming tankard transposed on a '20s car and a Tommy gun. It was very artistic, even though I do say it myself. I traced it from one of my dad's books. But when praised I shamelessly claimed it as my own work.
My teacher was quite amused by my project, I think. At least it gave her a break from reading about pioneers and the railroads.