This book [1] goes into great detail on the history and origins of the mafia - including the lemons. It's a great read.

[1] https://www.amazon.com/Cosa-Nostra-History-Sicilian-Mafia/dp...

For anyone interested in the history of the Italian mafia, I can't strongly enough reccommend this book: http://www.amazon.com/Cosa-Nostra-History-Sicilian-Mafia/dp/... (no affiliate link, I promise!)

It covers, in detail, this incident and talks about how it was a major turning point in people's perception of organised crime in Italy, and the change in attitudes of Italian people towards it.