Existing companies that produce and distribute gangster films

In this task, I will be looking at existing companies that produce an distribute gangster films such as the well known: Warner Brothers who have helped produce a huge, twenty six gangster films including: White heat, Angels with dirty faces, the roaring twenty's... See the whole list below: 

[This screen shot is for educational purposes only] screen shot taken from: 

http://www.imdb.com/list/CY8uRkXClN8/?start=1&view=compact&sort=user_rating:desc&defaults=1&scb=0.5345161948353052

From this task, i have found that distributors tend to make similar films to what they already produced and can use this information useful for my production.