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His first cousin, Alma, is the grandmother of Jeremy Jacobs, New York City Comedian. He was a victim of the Hollywood blacklist during the McCarthy "Red Scare" of the 1950s. Although he had already been signed, 20th Century-Fox wanted to remove him from The Day the Earth Stood Still. Producer Julian Blaustein felt that Jaffe was so crucial for the role of the Albert Einstein-like Prof. Barnhardt that he appealed to studio chief Darryl F. Zanuck. Zanuck approved Jaffe for the role, but it was his last Hollywood film until the late 1950s.