Earth's governing body, administering a planet of thirty billion people through a vast bureaucracy. The UN controls the most powerful navy by sheer numbers and governs a population where the majority survive on Basic - a universal income that keeps billions housed and fed but purposeless. The UN's relationship with Mars is one of mutual suspicion moderated by economic interdependence, while its relationship with the Belt is one of imperial oversight dressed as benevolence. The Secretary-General serves as head of state, with figures like Chrisjen Avasarala wielding enormous influence through political manoeuvring rather than military force.