Two top executives and two high-level officers at a consulting firm that serves lawyers and insurance companies were indicted by a federal grand jury last week on charges of designing a computer program that automatically inflated the bills it sent to clients.

Assistant U.S. Attorney Amy L. Kurland said the four individuals defrauded customers of S.T. Hudson International Inc. and several affiliated companies out of more than $320,000 between 1989 and 1994.