Garden of the Dead (1972)

So a bunch of convicts on a chain gang snort some industrial scale formaldehyde before attempting a mass escape from their incarceration. They are all shot by their diligent guards and hastily buried. That it? Of course not, they all rise again and determine to avenge themselves on humanity. Perhaps more notable as a zombie movie because these are less robotic and monosyllabic - or had less starch in their corsets. Indeed one or two of them might have been half decent at Scrabble; but the end product is at least 15 years past it's see-by date and hysterical nonsense.