I read some weeks ago about the Jarno Saarinen debacle at Monza in 73, a lot of reports say it is an excellent read.
Saarinen was born in Finland, but was revered in Italy, hence why there are Italians named Jarno. There are a few opinions how he came to lose his life, from oil on the track from a previous race, to another bike seizing in his race and wiping him out. There was a lot of controversy even before his race started, people objecting to track conditions and reporting it to Monza powers and threats of being ejected from the track. The FIM in those days were pretty corrupt by the accounts that I have read.
At the time, bikes were wheeled onto the grid from the pits, there were no sighting laps in those days and track conditions were only fully known on the first lap. Some riders raced in more than one class, so they had seen the oil laid on the track in the previous race. Saarinen was going to be the next big rider until his untimely death. I was only three years old at the time but I remembered his name.
More info came to light several years later when a newspaper article was found, there were pictures taken of the piston from the 'seized' bike that added more controversy to the story.
If anybody can remember any more than what I wrote here, I would love to know your opinion on the matter. I fully intend to buy the book one day.