Ghosts Run Wild (1941)
A group of juvenile delinquents are sent away to summer camp. When they sneak away from the camp, they meet a dark, mysterious stranger named Nardo (Bela Lugosi). Did I mention there's a killer on the loose? The East Side kids become convinced Nardo is the killer and that he has turned their friend into a zombie!!!
And if you enjoyed Ghosts Run Wild, here are a few more movies featuring Bela Lugosi that may be of interest!!!