Origin

First appearing in Sinestro #22 - Blood Red, four members were shown, though it was never specified if that is the totality of the members.

Major Story Arcs

Sinestro developed the Black Circle as a secret police to prevent potential threats from within the ranks of his own lantern corps. In their first appearance, two members of Sinestro's corps were seen plotting the assassination of Soranik Natu. They were stopped by the Black Circle.