Answer
Cosa Nostra, the answer to the previous question, refers to the Sicilian Mafia, one of the most powerful and well-known organized crime groups in the world. Falcone dedicated much of his career to investigating and prosecuting Cosa Nostra, leading to several high-profile arrests and convictions of its members. This helped expose their criminal activities and disrupt their operations, playing a significant role in the fight against organized crime in Italy.