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Hollywood actress Marsha Hunt, blacklisted during the "Red Scare" of the early 1950s, was able to find occasional work in England. Ms. Hunt is top-billed in Diplomatic Passport, but hers is a secondary role to hero Paul Carpenter. The latter plays an American diplomat who is being used as an unwitting courier by diamond smugglers.Honor Blackman, twixt and tween her "English Rose" period and her leather-clad Avengers days, is the femme fatale. Diplomatic Passport was co-produced by Burt Balaban, of American theatre-chain fame.