Unitatus was a secret society that was descended from the Unified Intelligence Taskforce, adopting a far more violent and xenophobic approach to their work, considering any alien as potentially violent where UNIT- thanks to the Doctor's influence- were willing to wait and learn if they were hostile rather than assuming it without proof. It was first active at least in the by the 26th century, where it suffered a devastating defeat when it tried to fight the Ferutu, its actions nearly resulting in the destruction of Gallifrey when Medford believed that the Time Lords were attempting to invade the Earth Empire before the Fifth and Seventh Doctors managed to save their history. (PROSE: Cold Fusion) Unitatus survived at least until the 30th century. (PROSE: So Vile a Sin)