La Cosa Nostra is a Sicilian Mafia organization that originated in Italy during the 19th century. It is known for its secretive nature, strict code of conduct, and involvement in various criminal activities, including extortion, drug trafficking, and money laundering. The term translates to "Our Thing," reflecting its emphasis on loyalty and family ties among members. The organization has a hierarchical structure, with a boss at the top, followed by underbosses and capos. La Cosa Nostra has had a significant impact on organized crime in the United States, particularly in cities like New York and Chicago, where it expanded its influence during the 20th century.