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 t… - Hugo Black

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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.