tat- ute to them did not constitute impermiss- ible ex post facto law. U.S.C.A. Const. Art. 1, § 9, cl. 3; 18 U.S.C.A. § 3143. *1031 Judith Dobkin, John Scully, Sp. At- tys., U.S. Dept. of Justice, Chicago, Ill., for plaintiff. Elliot Samuels, I. P. Lynch, Chicago, Ill., Joseph M. rata, Wheaton, Ill., f