That is not a "slave society". That is a slave market or a slave trade route.
A "slave society" is one in which the labor force is predominantly made up of slaves, especially on in which the number of slaves equals or exceeds the free population. There is no way to maintain that system without an authoritarian or totalitarian regime, be it centrally organized or effected at the local level. It is basic common sense, otherwise there would be a slave revolt and the owners would be dead in short order.
The issue is most societies historically had little distinction between government and the private sector, so slave revolts were handed by The Powers That Be using their wealth to control things. Weirdly enough your statement seems to be the most Orthodox Marxist statement anyone has made on this thread.
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