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Arthur Andersen LLP, based in Chicago, later named Andersen, was once one of the Big Five accounting firms, performing auditing, tax, and consulting services for large corporations. In 2002 the firm voluntarily surrendered its licenses to practice as Certified Public Accountants in the U.S. pending the result of prosecution by the Department of Justice over the firm's handling of the auditing of Enron, the energy corporation. http://en.wikipedia.org/wiki/Arthur_Andersen