He who defies a decision interpreting the Constitution knows precisely what he is doing. If sane, he hardly may be heard to say that he knew not what he did. Of course, willful conduct cannot make definite that which is undefined. But willful violators of constitutional requirements, which have been defined, certainly are in no position to say that they had no adequate advance notice that they would be visited with punishment. When they act willfully in the sense in which we use the word, they act in open defiance or in reckless disregard of a constitutional requirement which has been made specific and definite. When they are convicted for so acting, they are not punished for violating an unknowable something. [Screws v. United States, 325 US 91 – Supreme Court 1945 at 104-105.]
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