Collective
The Collective is an enigmatic faction of aliens known for selling other individuals into servitude, including the enormous and preternaturally durable Brutes.
Fiction
2005 IDW continuity
At some point, the Ilxian captain of a Tantiv-Nas bartered with the Collective and purchased Codder and Garnak to serve as shipboard custodians. Three years later after the ship crashed on LV-118, an irritated Admiral threatened to sell Codder and Garnak back to the Collective as soon they got off the planet. The Stars My Destination
Games
The Collective Brutes were selectively bred from a forerunner species that had been taken as specimens by the Collective many eons ago. Decepticon Directive