00226088 UNITED STATES Cite as 706 Irwin, 654 F.2d 671, 678-79 (10th Cir.1981); also see Goldstein, Conspiracy to Defraud the United States, 69 Yale L.J. 405, 454 (1959). The Irwin case is illustrative of the distinction between false statement and concealment under § 1001. There, the de- fendant, a gra