Mobsters are taking over a windy city labor union for various illegal enterprises. An honest union officer is framed for the murder of the union's accountant before the accountant can blow the whistle. Steve Farrell (Brian Keith), is the DA that brings the appearently strong case against the man. But something doesn't smell right and it's not yesterday's deep-dish. After learning that a critical piece of evidence was faked, he becomes determined to uncover the truth behind the murder.
"Chicago Confidential" is an adiquate, entertaining and fairly short film noir with a thin theme of city politics and plenty of classic thugs doing thug stuff. Brian Keith displays a strong performance as the determined district attorney, while the supporting cast is up to the vehicle, without being outstanding. There's a few examples of really interesting camera work, but the film is mostly conventional, if a little heavy on the close-ups. It's also worth noting some good establishing shots of period Chicago landmarks in the opening.
The film features two expansive scenes of technologies relatively new to audiences in the '50s. The first is a detailed explanation of what makes two fingerprints match. The other was the use of an elaborate setup of two oscilloscopes to compare two voice recordings on tape (tape itself was only in common use for maybe ten years at the time). The voice comparison, the key clue that the murder was a setup, as the film portrays it seems unlikely to work in reality. But the film is optimistic about the technology.
The film features bombastic narration particularly at the beginning, and the end. It seems intended to give a sense of gravity and news/documentary to a film that didn't have the budget to achieve that feel in other ways. It's borderline annoying.
One last rant... I'm always amazed at the power of law enforcement in these films. Police often effortlessly, for example, roadblock every exit from the city and whatnot. In "Chicago Confidential", one phone call grounds all air traffic at the city's airport. No questions asked.
In the end (which is a shootout at the airport), "Chicago Confidential" is not an iconic film noir, but is a solid crime drama with a few interesting touches. Worth a view, a little over 70 minutes...