The Carian Greek Herodotus, born not much more than a century later, tells us expressly that up to the time of Croesus, that is, to his own father's time, all the Greeks kept their freedom: and even if he means by this statement, as possibly he does, that previously no Greeks had been subjected to regular slavery, it still supports our point: for, if we may judge by Assyrian practice, the Enslaving of vanquished peoples began only when their land was incorporated in a territorial empire.
"The Ancient East"
D. G. Hogarth
Of course, he regards the religious prejudice against hunting and Enslaving men as springing from a fantastic notion of religion.
"A Letter to the Hon. Samuel Eliot, Representative in Congress From the City of Boston, In Reply to His Apology For Voting For the Fugitive Slave Bill."
Hancock
Well, what prevents the Government from Enslaving the people?
"Space Viking"
Henry Beam Piper