1) Authoritarian 2) Despot 3) Dictator 4) Hardliner 5) Martinet 6) Moralist 7) Stickler 8) Tyrant 1) Martinet 2) Stickler 3) Teacher 4) Yeller 
• (n.) One who disciplines; one who excels in training, especially with training, especially with regard to order and obedience; one who enforces rigid discipline; a stickler for the observance of rules and methods of training; as, he is a better disciplinarian than scholar. • (n.) A Puritan or Presbyterian; -- because of rigid adherence ...
Dis`ci·plin·a'ri·an adjective Pertaining to discipline. ' Displinarian system.' Milman. 
disciplinarian 1. Someone who insists that rules are obeyed strictly, and who punishes people who break them. 2. Anyone who enforces discipline (in an army, school, family, etc.). 3. An upholder or advocate of strict discipline.
a person who enforces or advocates discipline: The teacher was a formidable disciplinarian.