International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America. Nos. 12022-24, criminal, in circuit court of appeals for 8th circuit, Truck Drivers' Local No. 421, International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America v. United States; Ray Blankenship v. [same]; Earl Pfohl v. [same], appeals from district court for northern district of Iowa; brief for appellee.