The PC's group, as well as the management point for all the gangs and cults and stuff they run.
In the last century, a conspiracy was discovered, one devoted to the overthrow of arbitrary Monarchs and the establishment of Republicanism, the promotion of Reason and Equality. Eventually the group was discovered and hunted down ruthlessly, but the dream did not die, and the beacon of hope that is The Illuminati is reborn in Boston. Through brotherhood, exploration and understanding we shall build a dream for a new kind of world order, one where unending monsters do not rule over a quarter of the world.
... Or so goes the sales pitch. The actual experience of most people that join the Boston Illuminati bears out to be more like a social club than any kind of Enlightenment inspired radicalism.
Most people after all, won't meet the criteria of the True Illuminati, a group seeking to explore the limits of scientific and occult understanding to combat the horrors that stalk the night. The group selects for curiosity, moral courage and a will to fight, creating a small but dedicated network of occultists.