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Mr. Kunz long was ignored by the German justice system, where former officials were not that interested in going after relatively low-ranking camp guards. But in the past 10 years, a younger generation of German prosecutors has emerged who want want to bring all surviving Nazi suspects to justice.

While Mr. Kunz ranked fairly low in the Nazi hierarchy, he is among the top most wanted because of the large number of Jews he is accused of having been involved in killing. The prosecutor’s office in Dortmund puts that figure at 430,000.

The highest-profile guard on trial now is John Demjanjuk, the 90-year-old retired autoworker being tried in Munich for being an accessory to the murder of 28,060 Jews as a guard at the Sobibor death camp in occupied Poland. He denies he was ever a camp guard.

Mr. Kunz’s case came to light because of Mr. Demjanjuk. Authorities recently stumbled over Mr. Kunz’s case when they studied old documents from German postwar trials about the SS training camp Trawniki.

Prosecutors allege that both Mr. Kunz and the Ukrainian-born Mr. Demjanjuk, who was deported to Germany from the United States last year, trained as guards at the Trawniki SS camp.