Little Caesar (1931) on Netflix

Rico is a small-time hood who knocks off gas stations for whatever he can take. He heads east and signs up with Sam Vettori's mob. A New Year's Eve robbery at Little Arnie Lorch's casino results in the death of the new crime commissioner Alvin McClure. Rico's good friend Joe Massara, who works at the club as a professional dancer, works as the gang's lookout man and wants out of the gang. Rico is ambitious and eventually takes over Vettori's gang; he then moves up to the next echelon pushing out Diamond Pete Montana. When he orders Joe to dump his girlfriend Olga and re-join the gang, Olga decides there's only one way out for them.