The Committee

You may be looking for Central Committee of Mondas.

The Three Families were among the many human agents of the Committee (TV: Immortal Sins)

The Committee was a group of aliens from the planet Erebus.

They took over planets in Signus A, Omega Centauri, and Andromeda. Jack Harkness met them on Kepri 5 in the constellation of Fornax, where he told them that Earth had no intelligent life. (AUDIO: The Conspiracy)

In March 2005, Yvonne Hartman of Torchwood One was aware of the Committee's existence. (AUDIO: One Rule)

By 2006 the Committee had deemed the human race as "pests", and that they were hunt-worthy to alien races. (AUDIO: Moving Target)

In the late 2000s, the Committee came to Earth and realised Jack had lied to them. One of them assumed the name "Kate" and became the adopted daughter of journalist George Wilson. She told him real things about the Committee to put in his conspiracy theory books. When Sam Hallett got too close to the truth, she killed him and made it look like a suicide. Jack discovered Kate's nature, and went to confront her about Sam's death, but Kate killed George and left Jack to be discovered by the police. Jack fled, and left a recording for the Torchwood team to explain the situation. (AUDIO: The Conspiracy)

According to Jack, the Committee was also behind the Three Families and the 2011 Miracle Day. (AUDIO: Forgotten Lives)

Andy Davidson met the Committee in Cardiff in 2016. They posed as the power behind Torchwood. (AUDIO: Ghost Mission)