Earlier quoted context omitted.
See case of John Demjanjuk[1] . USA citizen was extradited twice: to Israel and to Germany as "nazi". After his death, FBI confirmed that they know that he is innocent. [1] https://en.wikipedia.org/wiki/John_Demjanjuk
The link says he was deported for concealing his involvement with a Nazi death camp on his immigration forms. Where did the FBI confirm his innocence?
In 2011 the Associated Press had uncovered a secret 1985 FBI report which indicated that a Nazi ID card showing that Demjanjuk had served as a death camp guard was a Soviet-made fake.