Over 500 officers took part in the raid on the Laudani clan in Catania, nicknamed "Mussi di ficurinia" ("Prickly pear lips"), in a sting that involved forces in Germany and the Netherlands as well, Italian police told AFP.
Three women, known as the "three queens of Caltagirone", a town near the Sicilian port of Catania, had ruled the clan with an iron grip as well as governing all "financial matters", but were brought down the heir to the clan who began helping police.
Of 109 arrest warrants issued today, 86 people were detained, 23 were already serving time in prison and six are still eluding capture, police said.
Giuseppe Laudani was selected to run the clan when he was 17 after his Mafia boss father was killed, and but he turned to the police and told how the three women, Maria Scuderi, 51, Concetta Scalisi, 60 and Paola Torrisi, 52, had raised him.
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Known as "the prince", he described a world of violence and vendettas, with the women building power after his aunt Concetta's life was saved by his father during an attempted assassination at the end of the 1980s, Italian media reports said.
Laudani also snitched on his brother Pippo and half-brother Alberto Caruso, as well as his grandfather Sebastiano Laudini, 90, who had served time between 1986 and 2012 and is now back under house arrest.
According to prosecutor Michelangelo Patane, the clan, which had sought ties with the cocaine-running 'Nrangheta mafia in Calabria, had a huge arsenal of weapons, including two bazookas.
The rocket launchers were intended for use in hits on several Sicilian magistrates but the plan was foiled when another informer told police the weapons were hidden in a garage on the slopes of Mount Etna.
Police said they had been hampered in their investigations by local business owners, who either lied about being the victims of attempts to extort money from them or admitted the extortion but refused to help identify those responsible.