This is George Romero’s 1968 Zombie film “Night of the Living Dead”. It is the basis for most of this sort of stylized zombie. A lot of movies were based on the same premise of people hiding someplace and being inadequate to zombie attack.
While boating in a boat we never see and possibly water-skiing without getting wet, a quartet of teens, Reg (Don Sullivan), Skip (Paul Pepper), Julie (Mitzie Albertson), and Pam (Brianne Murphy), accidentally discover an island run by a mad scientist named Doctor Myra who intends to turn everyone in the United States into a communist zombie, but we really don’t see any zombies and only a couple commies. Luckily it’s “Dreamboat” Don Sullivan to the rescue. I don’t seem to remember Don Sullivan singing in this one, but you should take appropriate precautions.
Dead Men Walk is a 64 minute, 1943, United States, black-and-white horror film produced by Sigmund Neufeld for Producers Releasing Corporation (aka PRC). It is an original story and screenplay by Fred Myton, starring George Zucco, Mary Carlisle, Nedrick Young and Dwight Frye, directed by Sam Newfield. It was originally distributed by PRC and reissued in the USA in 1948 by Madison Pictures Inc.
Joseph Javorsky, mild mannered commie scientist arrives in Yucca Flats in the United States after defecting.