Strangler Of The Swamp (1946)

Starring Rosemary La Planche, Robert Barrat, Blake Edwards, Charles Middleton, Effie Parnell
Directed by Frank Wisbar
(actor & director credits courtesy IMDB.com)

A village is haunted by the ghost of a wrongly condemned man who is strangling the men who brought about his death as well as their descendants.

I'd judge this as one of Poverty Row studio PRC's better horror films, perhaps due to the touch of Frank Wisbar, who per IMDB emigrated from Germany after running afoul of the Nazi government, and co-wrote and directed the film.  The movie's swamp sets are drenched in fog, which create a spooky atmosphere, while also serving to hide the appearance of Charles Middleton as the strangling ghost, who never appears in tight focus, but menaces his victims with the actor's chilling voice.  The filmmakers do an admirable job of bringing forth eerie moments on a low budget without using any special effects, and although their limitations are also on display, they've put out a film well worth seeing.  A young Blake Edwards, later to be acclaimed for creating the Peter Gunn TV series and writing the Pink Panther movies, has an acting role as La Planche's love interest.