Originally hailing from the planet Korugar, Sinestro once served as the Green Lantern of Sector 1417 and quickly gained recognition among the Corps for his ability to police his sector. However, peace came at a price.
Sinestro's determination to preserve order caused him to act more as a dictator than a protector. It wasn't until then new recruit Hal Jordan learned of Sinestro's methods that the Guardians were informed and Sinestro was ejected from the Corps. Steadfast in his belief of moral superiority and methods of maintaining order, Sinestro formed the Sinestro Corps, harnessing the yellow energy of fear, to not only combat the Guardians, whom he sees as the main obstacle on the path to intergalactic peace, but to also strengthen the Green Lantern Corps.
Sinestro's determination to preserve order caused him to act more as a dictator than a protector. It wasn't until then new recruit Hal Jordan learned of Sinestro's methods that the Guardians were informed and Sinestro was ejected from the Corps. Steadfast in his belief of moral superiority and methods of maintaining order, Sinestro formed the Sinestro Corps, harnessing the yellow energy of fear, to not only combat the Guardians, whom he sees as the main obstacle on the path to intergalactic peace, but to also strengthen the Green Lantern Corps.