It is cited as a film noir by Spencer Selby and Andrew Spicer.
Below are my notes about the film. As you can see, I'm not a big fan. Perhaps a Blackboarder can explain why it is paired with All the King's Men.
"Newspaper reporter, William Gargan, is asked by his mentor to finish a story based on an album that reveals names of Americans who paid the enemy handsomely, to cover their bets in case the Allies lost WWII.
"There’s some noir visual style, but mainly Cy Enfields screenplay, based on his own radio play, is a knock-off of the Maltese Falcon, in terms of the great whatsit and the carnival of characters, including Marjorie Lord as a soft femme fatale, working for one of the parties trying to get the album.
"The world of WWII hardly figures, and the world of hardboiled crime supersedes, including WG’s continual voiceover."