![Arnold Rothstein](https://static.hbo.com/content/dam/hbodata/series/boardwalk-empire/characters/s4/arnold-rothstein-1920.jpg?w=1200)
Arnold Rothstein
Played by Michael Stuhlbarg
Based in New York City, Arnold "The Big Bankroll" Rothstein is the biggest gangster in the country. A strategic thinker and consummate gambler, the man who fixed the 1919 World Series never makes a bet he doesn’t know he’ll win.