Sinestro Corps - Suicide Squad: Kill the Justice League

Named after their leader and founder, Thaal Sinestro, the Sinestro Corps are the enemies of the Green Lantern Corps and are responsible for maintaining the natural balance of fear in the Universe. 

After a failed invasion attempt of Earth, several Yellow Power Batteries fell into the possession of Batman. These would be used as the basis for the Babel Protocols' contingency plan against Green Lantern.