The Nazi-hunting Simon Wiesenthal Center on Thursday called on Holocaust survivors to come forward to help in the case of a suspected former Nazi collaborator who may have been involved in WWII genocide. Lajos Polgar, 89, is suspected of crimes while a member of the Arrow Cross, the Nazis' Hungarian allies. Polgar moved to Australia after the war and currently lives there. Efraim Zuroff, the Wiesenthal Center's chief Nazi hunter, called on Holocaust survivors who could give testimony about Polgar to help advance the case. No charges have been filed against him. "We are calling on the communities of Budapest," Zuroff said at a news conference. "Given the history of the Holocaust in Hungary, we are convinced that evidence can be found."