Authority

The Authority is an association of alien races who want to impose order to the cosmos.

In the Fractured Suns/Total Recall 2012 timeline
The Authority was a fascist organization which controls the core of the galaxy how they see fit. They are at war with every alien race that do not submit to them, including those at the Galactic Rim Worlds.

The Authority were chiefly responsible for destroying the Colony on Earth following the destruction of the Fall, a gravity elevator designed to travel through the planet's core to the other side of the planet, the United Federation of Britain.

In the The Destroyers (Iain M. Banks' Culture/Consider Phlebas) / Rekt Galaxies (Mortal Engines) timeline
The Free Space Authority is an interstellar state comparable to the GTVA.