The John Demjanjuk Case - NYTimes.com "John Demjanjuk, Accused of Atrocities as a Nazi Camp Guard, Is Dead at 91" (obituary, March 18) claims that the case against Mr. Demjanjuk for participating in Nazi persecution was "riddled with mysteries" and that "questions remained." There are no "mysteries" about Mr. Demjanjuk's service as a guard at several Nazi concentration camps, nor about the functions of guards at those places. Courts in Germany, Israel and the United States concluded that Mr. Demjanjuk worked as a guard at the notorious Sobibor death camp - where some 250,000 Jews were gassed to death - and other camps, too, after serving at the Trawniki SS training camp for Nazi guards. The obituary also misleadingly states that Mr. Demjanjuk was "reprieved" by the Israeli Supreme Court. While the court found insufficient evidence that Mr. Demjanjuk was a Treblinka guard, it still stated that Mr. Demjanjuk was a guard at Sobibor and was at Trawniki and thus "an integral part" of the Nazi "extermination machine." The court ruled that because Mr. Demjanjuk had been extradited to Israel on the Treblinka charge, he could not be prosecuted there for his acts at Sobibor. Courts in three countries found the same thing: John Demjanjuk participated in the murder of thousands of Jews at Sobibor. There are no "mysteries" about this finding, nor are there questions that remain. The writer, a former member of Congress, wrote the Holtzman Amendment, strengthening the law on deportation of Nazi war criminals.