The Fold is an organization created by the stadalla Janus after the end of the Second War. It is stationed in Atlantis and is comprised of both leaders of humans and proeathans. The Fold was made to give a place for both species to come together and work out what was best for both of their peoples. The Fold also acts as a sort of world government.
In the early days Janus would sit in on Fold meetings often to make sure things ran smoothly before taking a more backseat role. Even as time progressed there is still talk that if you fuck up too much Janus will appear to sort you out. Literally no one wants that since if you've fucked up enough to need a god to intervene you've really fucked up and probably someone is going to get thrown out or killed.