After his wife left him, petitioner Anthony Douglas Elonis, under the pseudonym "Tone Dougie," used the social networking Web site Facebook to post self-styled rap lyrics containing graphically violent language and imagery concerning his wife, co-workers, a kindergarten class, and state and federal law enforcement. These posts were often interspersed with disclaimers that the lyrics were "fictitious" and not intended to depict real persons, and with statements that Elonis was exercising his First Amendment rights. Many who knew him saw his posts as threatening, however, including his boss, who fired him for threatening co-workers, and his wife, who sought and was granted a state court protection-from-abuse order against him.

When Eloniss former employer informed the Federal Bureau of Investigation of the posts, the agency began monitoring Eloniss Facebook activity and eventually arrested him. He was charged with five counts of violating 18 U. S. C. §875(c), which makes it a federal crime to transmit in interstate commerce "any communication containing any threat . . . to injure the person of another." At trial, Elonis requested a jury instruction that the Government was required to prove that he intended to communicate a "true threat." Instead, the District Court told the jury that Elonis could be found guilty if a reasonable person would foresee that his statements would be interpreted as a threat. Elonis was convicted on four of the five counts and renewed his jury instruction challenge on appeal. The Third Circuit affirmed, holding that Section 875(c) requires only the intent to communicate words that the defendant understands, and that a reasonable person would view as a threat.

Held: The Third Circuits instruction, requiring only negligence with respect to the communication of a threat, is not sufficient to support a conviction under Section 875(c). Pp. 7-17.

(a) Section 875(c) does not indicate whether the defendant must intend that the communication contain a threat, and the parties can show no indication of a particular mental state requirement in the statutes text. Elonis claims that the word "threat," by definition, conveys the intent to inflict harm. But common definitions of "threat" speak to what the statement conveys--not to the authors mental state. The Government argues that the express "intent to extort" requirements in neighboring Sections 875(b) and (d) should preclude courts from implying an unexpressed "intent to threaten" requirement in Section 875(c). The most that can be concluded from such a comparison, however, is that Congress did not mean to confine Section 875(c) to crimes of extortion, not that it meant to exclude a mental state requirement. Pp. 7-9.

(b) The Court does not regard "mere omission from a criminal enactment of any mention of criminal intent" as dispensing with such a requirement. Morissette v. United States, 342 U. S. 246, 250. This rule of construction reflects the basic principle that "wrongdoing must be conscious to be criminal," and that a defendant must be "blameworthy in mind" before he can be found guilty. Id., at 252. The "general rule" is that a guilty mind is "a necessary element in the indictment and proof of every crime." United States v. Balint, 258 U. S. 250, 251. Thus, criminal statutes are generally interpreted "to include broadly applicable scienter requirements, even where the statute . . . does not contain them." United States v. X-Citement Video, Inc., 513 U. S. 64, 70. This does not mean that a defendant must know that his conduct is illegal, but a defendant must have knowledge of "the facts that make his conduct fit the definition of the offense." Staples v. United States, 511 U. S. 600, 608, n. 3. Federal criminal statutes that are silent on the required mental state should be read to includ