Many historians on the left are unwilling to renounce communism and the agents in this country who ran its insidious errands. Despite damning evidence from Soviet archives, Julius and Ethel Rosenberg, Alger Hiss, and other traitors remain the darlings of many leaders of the profession. Harvey Klehr documents how, in journals and recent textbooks, apologists are rewriting the cold war, condoning treachery, excusing the villains, and indicting as opportunists those who raised the warning against a very real fifth column. (Contains 14 notes.)