Ken Taylor, the Canadian diplomat celebrated 30 years ago for hiding U.S. embassy personnel during the Iranian revolution, actively spied for the Americans and helped them plan an armed incursion into the country.

Mr. Taylor, ambassador in Iran from 1977 to 1980, became “the de facto CIA station chief” in Tehran after the U.S. embassy was seized by students on Nov. 4, 1979, and 63 Americans, including the four-member Central Intelligence Agency contingent, were taken hostage.

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