Authority

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

In Scorched Space continuity
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 2018 Mortal Engines film adaptation
The Authority destroyed the Earth, thereby putting a tragic, but abrupt end to the Age of the Great Predator Cities of the West and ensuring a total and complete extinction of the human race.