Seeking to influence the Justice Department in its probe of the bank card associations, American Express Co. has been employing Robert H. Bork, an expert in antitrust law and former appellate judge.

Mr. Bork, a subject of national controversy in 1987 when the Senate rejected his nomination to the Supreme Court, registered with Congress last April as a lobbyist for American Express. The Justice Department had not then filed its antitrust charges against Visa U.S.A. or MasterCard International.

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