In the end they are the Muscle and Enforcers for the One World Government types that have coalesced into a single, albeit factionalized. Power Center.

The Uniparty is the Potemkin Village, performing the Theater that we have a Constitutional Republic. They perform at the behest of the One World Government. The "security state', as he calls it, is the Muscle that makes sure the system remains isolated from actual oppositional forces and keeps the people involved in the Uniparty on the straight and narrow. They make sure none of the Uniparty employees get any Ideas about who works for whom.