Traveller - Reach Adventure 6: Exodus - Rules of Play says:
Exodus is set near the borders of the Glorious Empire and the Aslan Hierate where centuries of warfare have devastated the region. The Glorious Empire has left billions of human slaves behind on the worlds they have lost. Eager to obtain the land on these worlds, the Hierate is torn between deporting the humans, converting them into a labour caste, or terminating them in a genocide of epic proportions. The Travellers’ voyage takes on symbolic meaning. Success could trigger a mass exodus of humans from Aslan space. Failure might spell their doom.