[Symmetry]

I would say that a pre-modern genocide would be done that was committed by roving bands of soldiers, rather than a bureaucracy.

A bit of research reveals I was wrong in my assumptions, though, and the Armenian genocide certainly counts by that metric.

http://en.wikipedia.org/wiki/Armenian_Genocide

[bumped]

That was the exact one I was thinking of. I really think you should look at the source that I linked to though. IBM knew what it was participating in and has since apologized (though never paid for it).