Mobster movies with interrogation scenes
 

Hi, I'm not looking for a specific Mafia/mobster/gangster movie, but rather for such including heavy interrogation scenes. I'm not looking for new/"modern" gangster movies either, but rather for those old/"classical" ones where the mafiosi still wear coats and hats and drive vintage cars with white tires, if you know what I mean.
Can you name me some violent Mafia/mobster/gangster movies?
Much obliged!