Article I, Section 9, Clause 3:
No Bill of Attainder or ex post facto Law shall be passed.
https://www.law.cornell.edu/constitution-conan/article-1/section-9/clause-3/bills-of-attainder
Article I, Section 9, Clause 3:
No Bill of Attainder or ex post facto Law shall be passed.
https://www.law.cornell.edu/constitution-conan/article-1/section-9/clause-3/bills-of-attainder