The Umojan Protectorate is one of the few Terran organizations that remain after the Great and Brood Wars.
It is currently lead by Minister Jorgensen and the Umojan Ruling Council. Though not as strong military wise as the Dominion, it is well known for its exceptional methods at gathering Intel. It should also be noted that it is one of the few factions willing to seek a truce with the Protoss. However, there has been little known interaction between them, so the likelihood of any future alliances is minimal.
After the second invasion of the Zerg, there have been rumors of Prince Valerian and Jim Raynor being sighted in Umojan territory. Speculation is rife that they may be discussing possible ways to over throw Arcturus Mengsk or openning negotiations with the Protoss to prevent any more attacks on colonies.
For more detail see Umojan Protectorate at the parent site.