Find the Blackmailer (1943)

"THE TALKING BLACKBIRD KNOWS THE SECRETS OF THE "SHAKEDOWN MURDERS"...But He Won't Talk!"

A private eye is hired by a mayoral candidate to prevent any sort of adverse publicity. It seems that, somewhere in town, there's a talking blackbird who insists upon saying that the candidate will commit a murder. When the killing occurs, the candidate is implicated, and the detective is off on a hectic pursuit of the incriminating crow and the actual murderer.