THE MASQUE OF THE RED DEATH (1964)
A European prince terrorises the local peasantry while using his castle as a refuge against the "Red Death" plague that stalks the land.
A CLOCKWORK ORANGE (1971)
In the future, a sadistic gang leader is imprisoned and volunteers for a conduct-aversion experiment, but it doesn't go as planned.
DEMONS OF THE MIND (1972)
A physician discovers that two children are being kept imprisoned in their house by their father. He investigates and discovers a web of sex, incest, and satanic possession.