Sing, dance, plenty hot (1940)

In this musical, a con man makes a good living by promoting bogus charity shows. He gets the communities all revved up and then skips town with all their money. But then he meets three earnest people wanting to garner financial support for an orphanage. This time the con man's loyal assistant finally catches on to the wicked scam and turns him in to the police. Meanwhile, the newly reformed assistant and one of the charity workers fall in loves.