Two prominent consumer groups sent a letter to Attorney General Janet Reno, aligning with American Express Co. and Dean Witter, Discover & Co. in a current Justice Department antitrust investigation of the credit card industry.

The Washington, D.C.-based organizations, Consumer Federation of America and Consumers Union, said in a letter dated March 18 that the Visa U.S.A. and MasterCard International rules the Justice Department is investigating hurt consumers.

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