So much about Juval Aviv is unconfirmable or comes tagged with that highly annoying cop-out caveat "based on true events". Apparently, he was a lethal Mossad assassin who led Israel's revenge attacks on the PLO terrorists responsible for the 1972 Munich Olympic massacre, but there is no official corroboration.

Aviv's (apparent) activities were the inspiration for the 1984 book Vengeance, and he was a consultant to Steven Spielberg on the movie Munich, which was based on the book. The lead character, Avner, is meant to be him. Canadian author George Jonas and Spielberg were satisfied with Aviv's authenticity, but his exact involvement in either project is conveniently inked out.

To add to the confusion, Aviv has written a novel about a newspaper tycoon who is murdered while on his yacht (plot details: CLASSIFIED), but any suspicion that this is about Robert Maxwell would mean it's your medication time.