The Insurrectionists were the UNSC's main enemy before the events in Halo: Contact Harvest, where the covenant quickly became the new antagonist. The insurrectionists would deal supplies with the Jackals in the early stages of the Human-Covenant war. As depicted in Halo: The Cole Protocol. They could be referred to as terrorists, due to them only impeding the UNSC's progress to colonize and prosper. The Have Not appeared in any of the Halo games where you play as the Master Chief.
The Insurrectionists were dubbed Innies by the Marines. Somewhat satirical when one considers how much they 'wanted out' of Earth's rule.
Operation TREBUCHET was one of the largest and farthest reaching operations ever conducted in UNSC history. It was devised in order to rid the galaxy of the Insurrectionists, once and for all, but was promptly abandoned following the beginning of the Human-Covenant War.
Insurrectionists were present far beyond the Outer Colonies. They colonized and inhabited Hesiod, the only Rebel colony not to have been destroyed by the Covenant. The Insurrectionists protected refugees from other colonies at The Rubble, where an uneasy truce existed between the humans and the Kig-Yar, who were the original inhabitants of the asteroids.[1].