ochlocracy

from WordNet (r) 3.0 (2006)

ochlocracy
    n 1: a political system in which a mob is the source of control;
         government by the masses [syn: {mobocracy}, {ochlocracy}]

from The Collaborative International Dictionary of English v.0.48

Ochlocracy \Och*loc"ra*cy\, n. [Gr. ?; 'o`chlos the populace,
   multitude + kratei^n to be strong, to rule, kra`tos strength:
   cf. F. ochlocratie.]
   A form of government by the multitude; a mobocracy; {mob
   rule}. --Hare.
   [1913 Webster] Ochlocratic