INQUIRY INTO G.M. IS ORDERED BY U.S.; Grand Jury Will Seek Data for Possible Trust Suit -- Subpoena Served INQUIRY ON G. M. ORDERED BY U. S.
Justice Dept orders broad grand jury probe of GM with view toward criminal antitrust action; documents covering GM divs transactions back to '29 subpoenaed; co chmn Donner comments; Asst Atty Gen Hansen repts broader probe set of 'undue concentration' in indus