CLEVELAND — Documents intended to prove a retired auto worker served as a Nazi death camp guard appear to date from the World War II era, two Secret Service experts testified Wednesday.

        Larry Stewart, laboratory director, and Thomas J. Smith, who directs the agency's review of disputed documents, testified for the government in its second attempt to strip John Demjanjuk of his U.S. citizenship.

        The government alleges the documents, which include Nazi-issued identification cards, prove the Ukrainian-born man helped the Nazis persecute European Jews during World War II. The documents also include work passes and a disciplinary report.

        Demjanjuk, now 81, denies that he ever helped the Nazis. He says he served in a Soviet Army artillery unit, was captured in 1942 and remained in German prisoner of war camps.

        The trial comes 20 years after Demjanjuk first lost his citizenship after being accused of being the sadistic guard “Ivan the Terrible” at the Treblinka death camp in Poland. That case led to a death sentence in Israel before Israel's Supreme Court acquitted him in 1993 after concluding “Ivan the Terrible” probably was someone else.

        This time, the Justice Department is arguing that Demjanjuk became a guard at other World War II death and forced-labor camps, mostly in Nazi-occupied Poland.

        Mr. Stewart testified in U.S. District Court that the documents placing Mr. Demjanjuk at various Nazi camps are on paper that is consistent with materials from the 1940s.

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