Misprision of a Felony / 18 U.S.C. Sec. 4 is a federal crime defined as the willful concealment of knowledge of a federal felony by one who is not a participant in the criminal act. It is a crime that is punishable by up to three years in prison and a fine of up to $250,000. There are three types of Misprision of a Felony under 18 U.S.C. Sec. 4: 1. Knowing of the commission of a federal felony and failure to notify authorities; 2. Knowing of a federal felony and concealing it from authorities; and 3. Participating in an act that constitutes a federal felony and then attempting to conceal it from authorities. The elements of the crime must be proven beyond a reasonable doubt to be convicted. The prosecution must prove that the defendant was aware of the federal felony, that the defendant concealed the felony from authorities and acted willfully.