rocess clause and the ex post facto clause. THE DUE PROCESS CLAUSE The liberty protected by the fifth amend- men includes freedom from punishment. Belli Wolfish, 441 U.S. 520, 535 n. 17, 99 S.Ct. 1861, 1871, n. 17, 60 L.Ed.2d 447 (1978). Thus, under the due process clause, a person may not be punished prio