Police in Italy arrested 63 people on Monday in a large-scale investigation into money laundering by the Camorra, specifically the Casalesi clan, based in Casal di Principe north of Caserta.

They are suspected of having laundered over €100 million euros for the Casalesi clan via “systematic and massive tax fraud”, police told Italian news agency Ansa.

The Casalesi clan is one of the most infamous and violent Camorra groups, best known as the clan whose death threats meant crime author Roberto Saviano had to live in hiding and will need bodyguards 24/7 for the foreseeable future.

With its stronghold in Casal di Principe, the Casalesis are active in crimes ranging from extortion and construction to waste management, prostitution, and drug trafficking.

They are comprised of several Camorra clans from the Caserta region. In past decades the clan underwent several violent wars between its bosses and committed over a thousand killings to maintain control over its territories.