Catechism of the Catholic Church §2256 — excerpt
Citizens are obliged in conscience not to follow the directives of civil authorities when they are contrary to the demands of the moral order. "We must obey God rather than men" (Acts 5:29).
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.