LET HISTORY JUDGE by ROY A. MEDVEDEV translated by COLLEEN TAYLOR 566 pages. Knopf. $12.50.
Not quite 20 years after Stalin's death, a Soviet scholar has produced the most comprehensive and revealing investigation of Stalinism ever to appear anywhere. Roy Medvedev, 46, is a schoolteacher turned historian. Like his twin brother, the prominent geneticist Zhores, he is a dedicated Communist and patriot, who believes in Marxism-Leninism and its vision of the future.* When he set about writing Let History Judge, Medvedev was motivated neither by disillusionment with the Bolshevik experiment nor by...