Mafias are organized crime groups that engage in illegal activities for profit, often using violence and intimidation. They typically operate in secrecy and have a hierarchical structure, with leaders who control various operations. Mafias can be involved in activities such as drug trafficking, extortion, and money laundering. The term "mafia" is most commonly associated with the Italian Mafia, particularly the Sicilian Mafia, but similar groups exist worldwide, including the Russian Mafia and Yakuza in Japan. These organizations often infiltrate legitimate businesses and can have significant influence over local economies and politics.