Citizenship is no light trifle to be jeopardized any moment Congress decides to do so under the name of one of its general or implied grants of power. - Hugo Black

[A]ny broad unlimited power to hold laws unconstitutional because they offend what this Court conceives to be the ‘conscience of our people’ ... was not given by the Framers, but rather has been bestowed on the Court by the Court.

Again, it is a new doctrine of constitutional law that one indicted for disobedience to an unconstitutional statute may not defend on the ground of the invalidity of the statute, but must obey it though he knows it is no law, and, after he has suffered the disgrace of conviction and lost his liberty by sentence, then, and not before, seek, from within prison walls, to test the validity of the law.

The First Amendment provides the only kind of security system that can preserve a free government – one that leaves the way wide open for people to favor, discuss, advocate, or incite causes and doctrines however obnoxious and antagonistic such views may be to the rest of us.