The Good and the Greedy: A Corps and a Tong of Green

For centuries, twin organizations existed centered around energies originating for planet Oa. In one universe, this was a good group of guys and gals assembled by the Guardians of the Universe was composed of various aliens throughout the galaxy known as the Green Lantern Corps. Each member was assigned a sector in space to protect, and provided with an emerald battery and ring, granting their owners with tremendous power. The first Corps member originating on Earth-One was Hal Jordan.

Concurrently, in the universe of Earth-Two, such emerald energies originating from the Starheart in the form of a gigantic green meteorite fell into the hands of the lamp-maker Chang. Possessing his power stone derived from this radiating rock from space, Chang later assembled his Green Dragon Tong which operated for untold ages. This Tong operated rivalry to the Tibetan Lamas who cared for the meteor and Chang's Lamp. The sinister syndicate of Chang, while tracking the wielder of the power ring Alan Scott, operated in Gotham City. 

This Tong came into conflict with that world's Batman and Robin in the 1940's, with several of its members perishing during that period of time. Despite their sheer number, which included a confederate tong of Hatchet-Men, the Green Dragon's were overpowered by the Caped Crusaders, with the Dynamic Duo seemingly finishing this Tong. Appearances, however, deceived the Darknight Detective and his Boy Wonder.

Chang’s original Tong was extinguished, and his large Green Dragon statue (built with meteor rock originating from the original Green Flame meteor he encountered centuries earlier) was demolished by the Batman. However, Chang himself escaped and would return years later, this time in pursuit of Batman’s Justice Society teammate and fellow Gothamite, Alan “Green Lantern” Scott.

Decades later, Chang reassembled his Tong into a tighter nit troop that lured Scott back to Gotham to plunder his power ring. While Chang himself had a counterpart in Shahn-Zi of Earth-One, both egomaniacal immortals, his Tong operated in a fashion similar to that of the Corps in a parallel universe... except without power rings. 

Those missing rings were possessed by Sinestro's "Sinestro Corps", his clones who briefly invaded Earth-Two before being overpowered by Alan and his Green Lantern counterpart of Earth-One, Hal Jordan. During the Crisis on Infinite Earths, just as the Green Dragon Tong had been rendered non-existence without their master Chang, who had perished, so too had the Green Lantern Corps' forces been depleted when several of their members and those of the Guardians also passing away during that cosmic conflict.