Demjanjuk was released to return to the United States. His return was met by protests and counter-protests, with supporters including members of the Ku Klux Klan. Even before his acquittal by the Israeli Supreme Court, the Sixth Circuit Court of Appeals had opened an investigation into whether OSI had withheld evidence from the defense. The investigation charged that OSI had ignored evidence indicating that Demjanjuk was not Ivan the Terrible, uncovered an internal OSI memo that questioned the case against Demjanjuk. After Demjanjuk's acquittal in Israel, the panel of judges on the Sixth Circuit ruled against OSI for having committed fraud on the court and having failed to provide exculpatory evidence to Demjanjuk's defense.