Cooperative

"The house rules are simple. You will refer to me only as "Ms. Venable." You may never leave the building. If you wander out onto the grounds, you will not be allowed back in due to the danger of radiation contamination. You will take your chances... with the canker pus monsters beyond the gates. [...] And no unauthorized copulation of any kind, under any circumstances, no exceptions. (- Emily: What? You're joking.) Ask the two Grays you saw on the way in if it's a joke. You'll find find the evening wear on the left side of the armoire. We dress for dinner. Cocktails in the music room at 6:30. Be prompt."

- Wilhemina Venable to Timothy and Emily about the rules of Cooperative

The Cooperative is the main antagonistic faction in American Horror Story: Apocalypse, the eighth season of American Horror Story led by people including Michael Langdon and Wilhemina Venable. The Cooperative operates the outposts during the apocalypse. They are a stern and serious group that is unafraid to use violence and murder in order to have the survivors cooperate.

Denial Upon Technology
The Cooperative denies the technology, considering this to be the world's own downfall

Purple and Gray
According to Venable, the people inside the Cooperative are under two different classes, named after the color of their own dress/uniform the Cooperative demands them to wear. The Purple is like aristocratic class,

Although claiming she is neither Purple nor Gray, but rather the face of the Cooperative, Venable is visibly offended as Emily asked if she's not a Purple. She also secretly wears a purple dress when she's carefree, and so does Ms. Mead, showing their hypocrisy and uncaring nature towards the survivors, even to the point of saying, "There's no Cooperation, only us." It's hinted that the Cooperative wants nothing but domination and oppression above the post-apocalypse survivors.

Even the Purple are restricted by the rules of the Cooperative, and if they violates, punishment and even execution will still be carried out.