From the back of the box:
The Oligarchs Expansion adds a sixth faction to Glenn Drover's Empires: Galactic Rebellion, allowing you to fight for control of the Galaxy with up to 6 players.
Will historians name your battle a failed rebellion, or will it be the start of a new and better empire? Take ownership over your faction, assert your supremacy, and fight for control of the galaxy! Topple the empire, join the Galactic Rebellion today!