Organisation is a term that can refer to a variety of different types of groups. A GUILD is an association of people with similar interests or goals, such as craftsmen or merchants. A setup is an arrangement of people or things in a particular way, often for a specific purpose. An INSTITUTE is an organisation devoted to research, education, or other activities in a particular field. The MAFIA is a secret criminal organisation, usually involved in activities such as extortion and illegal gambling. Finally, a PLOT is a secret plan or scheme, often involving criminal activity.