A former Ukrainian Nazi collaborator who assisted in the annihilation of more than 100,000 Jews in Poland has been stripped of his US citizenship and ordered deported to Ukraine, according to Daily Telegraph.

Osyp Firishchak, 88, migrated to the United States in 1949 and became a citizen five years later, lying about his war-time activities, the US justice department said.

He was identified decades later by a special branch of the justice department which has identified 107 Nazis or Nazi collaborators living in the United States since the branch was founded in 1979.

Mr Firishchak denied his involvement in the slaughter of over 100,000 Jews in Nazi-occupied L`viv, Poland and appealed against a 2005 ruling stripping him of his citizenship.

A Chicago immigration judge upheld that ruling which found that Mr Firishchak "was a participant in an organisation that perpetrated some of the most horrific acts against human decency ever known in history," rejected Mr Firishchak`s "completely unbelievable" testimony, and said that his "shameless attempt to excuse himself from an inexcusable act is cowardly".

Born in Trebuszany in present-day Ukraine, Mr Firishchak began working for the Nazi-operated Ukrainian Auxiliary Police as a private on October 25, 1941, a judge found in the 2005 ruling.

He participated in forcing the Jews of L`viv into a ghetto, seizing their valuables and taking the ill, weak and old to a nearby forest to be shot.

He also participated in hunting for Jews who attempted to flee the ghetto and then helping the Nazis clear the ghetto and send its inhabitants to concentration camps.

Mr Firishchak has until December 10 to appeal against the latest ruling. He would then be deported to Ukraine, the Chicago judge ruled.

Should Ukraine be unwilling to accept him, he is ordered removed to either Germany, Poland or "any country that will accept the respondent".