Mega Burg, over time, developed its own somewhat chaotic and decentralized government, even though some individuals over its existence attempted to unite all of Mega Burg under a single rat.
The difficulty of managing such a large colony came not only from its increasing size but also social and economic divides between all of the social castes.
The most widely accepted form of governing in the Colony is through a number of elders who are in charge of sections of the colony. Depending on the area the elder comes from however his arrival to power might be due to his personal charisma and influence, wealth, connections or strength. As an example an elder coming from the Lower Tunnels might in fact be a leader of a gang who has enough control over some of the tunnels to claim them as his own, while an elder from the Middle Tunnels could be a merchant who has managed to gather a few other rich individuals who thus pooled their resources together.
In order to manage important decisions in the colony the elders meet together in a sort of forum, or council. Here all of them may voice their ideas, vote on decisions and set a direction for the colony. Sadly, because the elders come from such varied backgrounds unless an issue is especially pressing the elders will rarely reach a unanimous decision.
While this would be an open invitation for the colony to fall apart, or collapse into civil war, most elders, with a few exceptions, do not see any benefit in that. A large semi-unified colony is better than a bunch of packs trying to kill one another.
That said the only force that is not under the control of the elders, no matter how they try to change that, are the protectors.
While their initial role was to protect the colony and uphold the law over time they became a political power of their own. The one key resource they control which allows them such power is a monopoly on the primary food supply of the colony, as well as relative control over many entrances and exits to and from the colony.
For this reason the leader of the protectors was sometimes called a Tyrant, when he would force the elders, or those living in the colony, to obey his own laws or decisions.
This lead some of the elders to try and form their own militias or gangs, to better control their territories, but they always lacked the strength to challenge the protectors.
As such while in theory the many elders control sections of the colony and rule over the colony together if something is done that the protectors do not approve of it was not unheard of that elders would quickly lose their positions.
There is no fixed number of elders, and an elder is more of a title than an official position. In a way it is other elders who decide who is worthy of being considered an elder and as such being allowed to voice his opinion during meetings and to have a valid vote.