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By Lawrence Hurley and Nate Raymond WASHINGTON/NEW YORK (Reuters) - The U.S. Justice Department asked the Supreme Court on Thursday to reverse a federal appellate court's insider trading ruling, calling it a "roadmap" for potential criminals that undermined efforts to ensure the "integrity of the securities markets." Solicitor General Donald Verrilli filed a petition seeking review of a December ruling by the 2nd U.S. Circuit Court of Appeals in New York that reversed the insider trading convictions of hedge fund managers Todd Newman and Anthony Chiasson. The ruling marked a major setback for an insider trading crackdown underway since 2009 under Manhattan U.S. Attorney Preet Bharara, whose office brought charges against 96 people.