Any Gang above Respect level 30 can form a Cartel. A Cartel can have max. 10 gangs and a minimum of 1 Gang, but all of them must have the same color.
During a tournament, when a gang belonging to one cartel wins from a gang of another cartel, the tournament points won by a gang are also added to the ranking score of Cartel. At the end of tournament, based on the total score, rewards are given out to top cartels.