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Though records do not show that Karkoc had a direct hand in war crimes, statements from men in his unit and other documentation confirm the Ukrainian company he commanded massacred civilians, and suggest that Karkoc was at the scene of these atrocities as the company leader. Nazi SS files say he and his unit were also involved in the 1944 Warsaw Uprising, in which the Nazis brutally suppressed a Polish rebellion against German occupation.

The U.S. Department of Justice has used lies about wartime service made in immigration papers to deport dozens of suspected Nazi war criminals. The evidence of Karkoc’s wartime activities uncovered by AP has prompted German authorities to express interest in exploring whether there is enough to prosecute. In Germany, Nazis with “command responsibility” can be charged with war crimes even if their direct involvement in atrocities cannot be proven.

Karkoc refused to discuss his wartime past at his home in Minneapolis, and repeated efforts to set up an interview, using his son as an intermediary, were unsuccessful.

Efraim Zuroff, the lead Nazi hunter at the Simon Wiesenthal Center in Jerusalem, said that based on his decades of experience pursuing Nazi war criminals, he expects that the evidence showing Karkoc lied to American officials and that his unit carried out atrocities is strong enough for deportation and war-crimes prosecution in Germany or Poland.

“In America this is a relatively easy case: If he was the commander of a unit that carried out atrocities, that’s a no brainer,” Zuroff said. “Even in Germany … if the guy was the commander of the unit, then even if they can’t show he personally pulled the trigger, he bears responsibility.”