Who is Detective Buddy Russo in the motion picture, The French Connection?

Detective Buddy "Cloudy" Russo is Doyle's sidekick. Although Cloudy does a lot of work to solve the case, he always seems to be second to Doyle. Cloudy is a tough guy, and without him, the case could not be solved. Cloudy is the one who realizes the differences in weight between the car when it entered the country and when it arrived in the shop. Cloudy is also the one who discovers some of the most important clues in the case.

Although Cloudy is not targeted by the hit man and thus, doesn't participate in the great chase scene, Cloudy is tough and helps Doyle to make busts and get information. Cloudy also helps Doyle convince the rest of the force that the major heroin deal is going to happen and that they can stop it.