Similar to its Brother-Genre "Police Procedural", is the Sub-Genre that Emerged in the Low-Budget World of B-Movies in the 50's were "Exposes" with Sub-Titles like "Uncensored, Confidential, Exposed" Etc.
Usually Attached to a Big-City or Big-Corps (Garments, Docks) that Organized Crime Infiltrated after the Repeal of Prohibition.
Most were Unremarkable, although a Few like "Kansas City Confidential" (1955) and "The Phenix City Story" (1955) are Bona-Fide Classics of the Genre.
This One, takes an Obvious Cue from "On the Waterfront" (1952) the Marlon Brando Award Winner.
It Pales in Comparison but does have a Certain Gravitas Helped by B-Movie Stalwart Director William Castle.
Arthur Franz who Made quite an Impression in the Psychological, Pathological, Film-Noir "The Sniper" (1952), is Solid as the Protagonist.
Also some Good Character Actors like Mike Mazurki, Michael Ansara, and B-Movie Babe Beverly Garland Help this Rise Above Average.
The On-Location New Orleans Footage Helps Set the Stage and the Movie Contains some Genuine Intrigue of Mob Infiltration, On the Docks Violence, and Worker Intimidation.
Overall, Better than Most.