I have long thought that 'Zombies' made their first Silver Screen appearance in Night Of The Living Dead (1968),
but I was doing a little movie 'research' the other day and found this public-domain masterpiece:

White Zombie (1932, HD/720p) @ YouTube

Depending on your viewpoint, this film is either totally black-and-white, or simply politically incorrect.

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Hadn't totally forgotten it, but could only recall a few details. Will have to watch it when time permits.

Otony

There's this one from 1940:

http://www.youtube.com/watch?v=BAIpI8IxgFs