I would like to shed some light on this "mafia expert".

Saviano is officially known in Italy to be a writer, way more than a journalist - actually he was completely unknown before his first book "Gomorra", which made him famous, and he admitted not to be "a journalist, (nor a reporter), ... but a writer" (http://www.thedailybeast.com/articles/2015/09/24/mafia-autho...). I would add that in Italy he is pretty known to be a good show-man, even more than a writer.

Not that i have any aversion to Roberto Saviano, but i would strongly prefer to see Giovanni Falcone being mentioned, above and before any other real (or so-called) anti-mafia warrior (anti-mafia means a lot of professional layers of "antiness").