Misprision, as noted in the Black's Law Dictionary, includes: "neglect of light account made of a crime, that is, failure in the duty of a citizen to prevent the commission of a crime, or, having knowledge of its commission, to fail to reveal it to the proper authorities.

Title 18 § 4 of the United States Code declares the law in the case of Misprision of Felony:

Whoever, having knowledge of the actual commission of a felony cognizable by a court of the United States, conceals and does not as soon as possible make known the same to some judge or other person in civil or military authority under the United States, shall be fined not more than $500 or imprisoned not more than three years, or both.