Ivan Demjanjuk was a Ukrainian who, after WWII, became a naturalized U.S. citizen, only to have his citizenship revoked in the early 1980s. He was found to have lied on his U.S. immigration application, having served as an SS guard at both Treblinka and Sobibor.
Suspected of being Treblinka’s Ivan the Terrible, responsible to the deaths of hundreds of thousands of Jews, Demjanjuk was extradited to Israel in 1986. Based on various pieces of evidence, he was sentenced to death by hanging in 1988 (Israeli law allows capital punishment for crimes against humanity).
Due to various discrepancies during the trial, including evidence linking him to Sobibor at the same time Ivan the Terrible was at Treblinka, his conviction was overturned in 1993. An additional trial, for his crimes at Sobibor, was not held because of a technicality. He was extradited from the U.S. to be tried as Ivan the Terrible, and trying him again based on the same extradition would constitute double jeopardy (which is allowed in Israel, but not the U.S.).
After returning to the U.S. and losing a long battle with the INS, Demjanjuk was scheduled to be deported to the Ukraine. Now Germany has filed for extradition so that he will brought on charges for the responsibility of killing 29,000 Jews at Sobibor.
I hope they finally succeed in putting him behind bars for the remainder of his life. Unfortunately he will be in prison, and not suffering like his victims did in the hell known as Sobibor. May he rot in hell.