Historian Stefan Klemp investigates the role of the German postwar criminal justice system system in aiding the perpetrators of the Rechnitz massacre - the murder of roughly 200 Jews. http://www.signandsight.com/features/1591.html
How many of these are still unaccounted for. For every one that is now known, there must be 10, 20, 30 or more of similar magnitude that will never be revealed.