There are a variety of synonyms for the term "association of criminals." Some of these include organized crime, gang, mafia, syndicate, mob, and cartel. These terms refer to groups of individuals who collaborate to engage in illegal activities such as drug trafficking, extortion, and other forms of organized crime. Such groups often operate in a hierarchical structure, with a leader or boss at the top. Members of these associations may be bound by oaths of loyalty and secrecy, and often work to protect each other from law enforcement or other threats to their activities. The use of these terms is often dependent on the specific type of criminal activity being discussed or the region in which they operate.