Italy's southern Puglia region is the territory of the Sacra Corona Unita, also known as the "fourth mafia". Less well known than Cosa Nostra, the Camorra or the 'Ndrangheta, the criminal group is still very powerful. It has infiltrated all sections of Italian society, from local firms to public administration. Our reporters went to meet a group of women who are taking on this mafia group, despite the risks to their own lives.