tyranny
tyr·an·ny ˈtir-ə-nē
1: oppressive power
especially : oppressive power exerted by government the tyranny of a police state
2a: a government in which absolute power is vested in a single ruler
especially : one characteristic of an ancient Greek city-state
b: the office, authority, and administration of a tyrant
3: a rigorous condition imposed by some outside agency or force
4: an oppressive, harsh, or unjust act : a tyrannical act