Harvey Klehr is the co-author, with John Haynes, of The Secret World of American Communism and Venona: Decoding Soviet Espionage in America. His new book, The Millionaire Was a Soviet Mole: The Twisted Life of David Karr, is forthcoming in July from Encounter.
But notoriously some, like Morton Sobell, were both. For the Jewish community, their highly visible profile was a constant source of tension and embarrassment.
Communist parties worldwide, including in the U.S. and Palestine, took their orders from Moscow, which meant that—with one consequential exception—they opposed Zionism.