This is the other side of the mirror held up by Amos Elon in Journey Through a Haunted Land (p. 1324); it also is ably written and in today's climate of concern over neo-Nazism in Germany and elsewhere it should find an audience. Wiesenthal, a concentration-camp survivor, organized and operates a Documentation Center; its files have been instrumental in the apprehension and prosecution of Nazi war criminals, most notably Adolf Eichmann. At Joseph Wechsberg's request, Wiesenthal has compiled his most unusual ""cases"" and they are both stirring and profound. An architect by profession, he pursues this work from conviction on behalf of Justice and the future, not from motives of hate or revenge. He shows intimately the breakdowns in postwar ""denazification"" programs, warns that biology is catching up (""in a few years there will be no... witnesses to what happened in the death camps"") and contends that public opinion polls reveal that ""the more trials, the weaker the Nazi revival."" Youth, he observes, must be armed with the truth so that Germany's new democratic institutions may thrive unhampered.