a group of manufacturers, suppliers or smugglers that aims to wipe out competition, often through illegal actions such as violence and bribery, in order to keep prices and demand high;
e.g. The cartel had a stronghold on the heroin market in the area.
(noun)
an arrangement between political parties in order to promote or achieve a common interest or goal;
e.g. Historically, cartels were popular arrangements between political parties.