Question

Punishing someone for an action that did not used to be a crime is an example of ?

Answer 1

This would be an example of an ex post facto law.

Step-by-step explanation:

Answer 2

This would be an example of an ex post facto law.

An ex post facto law retroactively changes the consequences of a committed act and the act itself has been committed before the law passed and went into effect. In the United States the ex post facto laws are forbidden by the Constitution of the United States, by the Article I.