Not a lawyer, but I would think that since one may not be allowed to profit from his crime, and CM’s only claim to fame was his crime, then there may be issues with his heirs, whomever they may be, to likewise profit from his crime. I don’t know where they draw that line. The perp? Next of kin? I know people have made profit off of it in the form of books and whatnot.
Except that Manson’s crime was not his only claim to fame.
He was a talented song-writer whose work was covered once by the Beach Boys and at least once by Guns and Roses.
I thought Son of Sam laws were overturned by the courts.