Source : Webster's Revised Unabridged Dictionary (1913)

Mobocracy \Mob*oc"ra*cy\, n. [Mob rabble + -cracy, as in
   democracy.]
   A condition in which the lower classes of a nation control
   public affairs without respect to law, precedents, or vested
   rights.

         It is good name that Dr. Stevens has given to our
         present situation (for one can not call it a
         government), a mobocracy.                --Walpole.