LECCE, Italy — It was a scene straight out of ''The Godfather.'' On the night of Feb. 1, a bloody goat head with a butcher's knife through it was left on the doorstep of Judge Francesca Mariano's home in southern Italy, with note beside it reading, ''like this.''
Mariano had already received threats, including notes written in blood, after she issued arrest warrants for 22 members of a local mafia clan that operates in southern Puglia, the heel of Italy's boot.
Puglia is known for its olive groves, cone-shaped ''trulli'' white-washed houses, and spectacular coastlines that will provide the backdrop when Premier Giorgia Meloni hosts Group of Seven leaders for their annual summit this week.
But the region is also home to the Sacra Corona Unita, Italy's fourth organized crime group. It is far less well-known than Sicily's Cosa Nostra, the Calabrian ‘ndrangheta or the Camorra around Naples, but just as effective in infiltrating everything, from local businesses to government.
And yet, a remarkable array of women like Mariano is challenging its power structures at great personal risk. They are arresting and prosecuting clan members, exposing their crimes and confiscating their businesses, all while working to change local attitudes and cultural norms that have allowed this mafia to establish roots as deep as Puglia's famed olive trees.
''I don't believe anyone who says they're not afraid. That's not true,'' said Marilù Mastrogiovanni, an investigative journalist and journalism professor at the University of Bari who has written in-depth stories about mafia infiltration for her blog.
''Courage is moving forward despite the fear,'' she said.
The Sacra Corona Unita, or SCU, is the only organized crime group in Italy whose origins are known: A local criminal founded it in the Lecce prison in 1981, in part to push back other mafia groups that were trying to infiltrate the area.