In Italy this is considered a B-movie. Anyway it is a sort of thriller, very rich in strange and funny characters, sometimes a little exaggerated. Dialogues are often based on Roman dialect which could be difficult to understand (sometimes it is even for Italians). Among conversations, there's a lot of gags, especially between two main characters, Nico Giraldi and Venticello, representing people coming from the same poor, post-war background. One of them is a policeman (Nico), the other one (Venticello) is a definitely unlucky, ignorant, little thief. Once were friends. In a way, they still are. The main soundtrack theme is obsessive and distressing, creating a suspense that's difficult to imagine. I saw this movie several times, but from time to time I like to watch it again, just for fun. A movie rich of rude dialogs and scenes that make you laugh even before any of the characters has the chance to speak. It could be considered a B-movie but I think that soon it will be re-evaluated.