Rebel

Rebels are any group that wants to break away from a primary government. "Rebel" may refer to the following:

In the UNSC:
 * Frieden Rebels - A secessionist faction that fought against the UN in the Interplanetary War.
 * Koslovic Rebels - The neo-Communist faction that fought against the UN in the Interplanetary War.
 * Insurrectionists- The general name for rebels during the Insurrection.
 * Secessionist Union - A rebel union on Harvest led by Jerald Mulkey Ander.
 * Unidentified insurrectionist group - An unknown rebel group that resides on Harvest and Arcadia.

In the Covenant:
 * The Heretics - The breakaway faction that followed Sesa 'Refumee and was against the Great Journey.
 * Covenant separatists - The Elite led faction after they learned the truth about the Halos.
 * The Grunt Rebellion - A Grunt uprising against the rest of the Covenant which led to the creation of an Arbiter.