That's been common knowledge for many years - but he may have recently decided to become a full-time criminal. Bit like Julian Assmange and Jim Dumbell.
I did a little library research, checking Black's Law Dictionary. Here is the entry for this item: "Misprision of felony. The offense of concealing a felony committed by another, but without such previous concert with or subsequent assistance to the felon as would make the party concealing an accessory before or after the fact. United States v. Perlstein, C.C.A.N.J., 126 F.2d 789, 798. Elements of the crime are that the principal committed and completed the felony alleged, that the defendant had full knowledge of that fact, that the defendant failed to notify the authorities, and that defendant took an affirmative step to conceal the crime. U.S. v. Ciambrone, C.A. Nev., 750 F.2d 1416, 1417. Whoever, having knowledge of the actual commission of a felony recognizable 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, is guilty of the federal crime of misprision of felony. 18 U.S.C.A 4." See also Obstructing Justice in Black's Law Dictionary.
