Federal Army of Chorus

The Empire is a faction in Red vs. Blue using tyranny and consists of hostiles soldiers. They are fighting against the New Republic for control over the planet Chorus.

Overview
According to Felix, an affiliate of the New Republic, after the Great War between the humans and the aliens came to a close, the outer colony of Chorus was forgotten by the UNSC and left to fend for themselves. After a while, the citizens of the planet attempted to govern themselves, but soon the Empire was formed, which attempted to take over the entire planet and put everyone under their supervision. Due to their actions, they caused the faction known as the New Republic to for, as they wanted their independence. As a result, this led to a Civil War on Chorus.

Trivia

 * The Empire and Project Freelancer both have ties to the UNSC. The former was deserted by the military group, while the latter was originally created to be a splinter group.
 * The 'Empire' might be a pun of the Galactic Empire, a famous faction in the Star Wars franchise.