Here’s some dirt on the modern USF faction that was written up before the USF arc began.
The Unukalhai faction can be traced back to a group of colonists who escaped from the Bombardment of various worlds with a number of key ships and designs, including the colony seed ship Concord about 23 Years ago at the conclusion of the Unukalhai Uprising. rumors have been abound of recruitment over the past 10 or so years to their cause from various human colonies throughout the USFP and the Security Services Bureau have apprehended a number of agents over the last few years. About 12 months ago the theft of 124 mines from the Promethean Border Region’s defense grid was attributed to Unukalhai agents, but this has not been confirmed. The Unukalhai themselves are smart despite their human supremacist attitude. (and have been using influence and various dirty tricks to play species off one another to keep them weak). There have been theories that the Unukalhai have been supporting the myriad Pirate “corporations” (building hulls, safe refuge) in order to sow unrest, harass TSN assets, and damage shipping within the USFP.
In short basically they had established an underground colony somewhere on the fringe of Terran space, have been building up, developing their subterfuge and Del Pinos to stab us in the back.