I'll keep Pietro Piazza's background brief, except that I suspect he's an important member of Cosa Nostra in Marseille, due to his ties to the Di Pisa family in Misilmeri (I explain all that here viewtopic.php?t=7900&start=225).
So to get back to Adragna, I was researching the 1963 case mentioned in the other thread, and I came across a doc on Mary Ferrell mentioning that Piazza was Adragna's brother-in-law.

I haven't yet taken the time to look up who Borgese & Bova were, but I assume they were mobsters from NY or Pittsburgh. For your information, the Piazza/Vincileoni affair was apparently a big deal at the time and, due to the advanced age of the protagonists, earned the name "the case of the peaceful retirees." in the press
The name Adragna would resurface alongside that of the Piazza some twenty years later (in 1986 to be precise) when Mariano (son of Pietro) and his cousin of the same name were arrested in Marseille in a case linked to the Pizza Connection (I had shared a series of articles that talk about it here viewtopic.php?t=12530 and I talk about it in part in one of my articles https://unehistoiredecrimeorganise.blog ... ction.html)
George Adragna was arrested in San Jose during this blitz. His wife, Rosa (born Lo Cicero), was also arrested and was facing extradition to Italy (I don't believe this happened).
Some articles mention that Rosa Adragna was Mariano "Mario" Piazza's aunt, so I assume Pietro was married to one of Rosa's sisters but I'm very bad at genealogical research, so I leave that to the experts...
I'm not sure if the connection between the Piazza and Adragna families has been discussed here before, so I'll take the liberty of writing a thread about it.
Lennert had already mentioned Adragna to me in a thread where I mentioned the Piazza cousins (viewtopic.php?p=219201&hilit=adragna+piazza#p219201), but I was unaware of this family connection.
And on a side note, the family being from Alcamo, that gives us another connection between mafiosi from Alcamo and the French mob (the Mancuso brothers https://unehistoiredecrimeorganise.blog ... -york.html).