Public Pigeon No. 1

Public Pigeon No. One is a 1957 comedy film directed by Norman Z. McLeod. It stars Red Skelton and Janet Blair.

A con man, Harvey Baker, is able to persuade Rusty to buy his worthless uranium certificates, claiming they are worth 10,000. His cronies Rita and Frankie take the swindle further, resulting in Rusty losing his job at a cafe and Lt. Qualen of the bunco squad letting him know that these are wanted crooks with a 10,000 reward on their heads.Rusty accidentally finds out where Rita is and follows her. He is so gullible, he believes it when told they are actually agents working secretly for the FBI. He ends up a pigeon for their scheme, arrested and sentenced to five years in prison. ........

Source: Wikipedia