How many movies have Alfred Hitchcock and Fred Ahern collaborated on?

They have worked on 4 movies together! Their first movie together was Spellbound (1945) while their highest rated movie together was Rope (1948). They have not worked together since Stage Fright (1950). They are most known for their thriller films together.

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Man Staring at Eve on Street (uncredited)
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Man Walking in Street After Opening Credits (uncredited)
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Man Leaving Elevator (uncredited)