In the RPG Conspiracy X Aegis are the secret organisation to which the PCs belong. Aegis members are usually members of another more well known organisation or government body such as the FBI or CDC. Aegis is structured as groups of cells for maximum security each cell is independant of each other and have no direct contact with their superiors.
All of the information uncovered by the independent cells is uploaded and collated on a giant supercomputer called HERMES. This information is then accessible to each of the cells through the hermes unit each agent has.
Kinda like everything no?
Aegis has taken upon itself the duty of protecting mankind, but there is a similar group with a far less noble purpose, the Black Book who work closely with the alien race known as the greys.