The threat, use, or conspiracy to use weapons of mass destruction within the United States or against an American citizen abroad is punishable under federal law.
The municipalities, states, and the federal government each tend to have their own criminal codes, which tend to define the types of conduct that constitute crimes. So, the Title 18 of the U.S. Code outlines all the federal crimes.
However, a crime is an unlawful act which is said to be punishable by a state or the other authority. Thus, the use of mass destruction is said to be punishable under the federal law.
Hence, treason is the only crime which is defined in the U.S. Constitution.
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