The Kings of the Sun was a gang that operated in Gotham City. Formed after the Arkham War, they were one of few gangs that managed to gain their own footing without being immediately topped by the Penguin's Empire or the Batman.
Starting of their organization in New Orleans, when Carmine Falcone returned to Gotham City and waged war with the Penguin, the Kings of the Sun moved there. Suppliers of Icarus, the Kings of the Sun kidnapped a nuclear metahuman in order to keep creating the drug at the Kane Power Plant. Being the suppliers, they began to have the gang of Mr. Squid deal it out. Eventually, however, things went sour and a high ranking King, Holter, declared war on the Squid's gang. Eventually, Holter killed Mr. Squid.