Symmetrists

Symmetrists are a group of people within the Federation that consists of primarily Vulcans who are essentially an environmentalist group. They believed that the Federation's agriculture is too uniform and that there is a danger of all agricultural crops could be wiped out in the event of a plague. Sarek was a member of this group at one time however left when they started using more violent and dangerous methods to achieve their aims which included creating the Virogen plague. They later unleashed this deadly plague on the Federation which created widespread chaos and the potential of killing billions.

(Star Trek novel: Avenger)