Criminal offense

Definition and stakes

United States v. Classic — Opinion of the Court

Section 19 of the Criminal Code condemns as a criminal offense any conspiracy to injure a citizen in the exercise 'of any right or privilege secured to him by the Constitution or laws of the United States'. Section 20 makes it a penal offense for anyone who, 'acting under color of any law' 'willfully subjects, or causes to be subjected, any inhabitant of any State * * * to the deprivation of any rights, privileges, or immunities secured or protected by the Constitution and laws of the United States'.
Source: Wikisource

Stanley Matthews Kring v. State of Missouri — Dissent

In respect to criminal offenses it is undoubtedly a maxim of natural justice, embodied in constitutional provisions, that the quality and consequences of an act shall be determined by the law in force when it is committed, and of which, therefore, the accused may be presumed to have knowledge, so that the definition of the offense, the character and degree of its punishment, and the amount and kind of evidence necessary to prove it, cannot be changed to the disadvantage of the party charged ex post facto.
Source: Wikisource

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