The Collaborative International Dictionary
dulocracy
Doulocracy \Dou*loc"ra*cy\, n. [Gr. doy^los slave + kratei^n to
rule.]
A government by slaves. [Written also dulocracy.]
--Hare.
Wiktionary
dulocracy
n. A government where servants and slaves have so much license and privilege that they domineer or belord; predominance of slaves.