Justice Stevens, delivered the opinion of the Court.
Petitioner was convicted of "willfully" dealing in firearms without a federal license. The question presented is whether the term "willfully" in 18 U. S. C. § 924(a)(1)(D) requires proof that the defendant knew that his conduct was unlawful, or whether it also requires proof that he knew of the federal licensing requirement.
I
In 1968 Congress enacted the Omnibus Crime Control and Safe Streets...
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