1) Government by the masses 2) Political control by a mob 3) The mob as a ruling class 
government by mobs or crowds
• (n.) A condition in which the lower classes of a nation control public affairs without respect to law, precedents, or vested rights.
Mob·oc'ra·cy noun [ 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...
mobocracy 1. The rule of the mob, government by a mob. 2. The `mob” or lowest class as a ruling body. 3. A ruling or politically supreme mob.
ochlocracy noun a political system in which a mob is the source of control; government by the masses
political control by a mob. · the mob as a ruling class.