The leader of an eastern European neo-Nazi group has been extradited to the United States from Moldova following his arrest last summer for allegedly instructing an undercover federal agent to dress as Santa Claus and hand out poisoned candy to Jewish children and racial minorities, prosecutors have said.

Michail Chkhikvishvili, a 21-year-old originally from Georgia, was arraigned on Friday before a federal judge in Brooklyn on multiple felonies, including soliciting hate crimes and acts of mass violence.