Som svar på din fråga använde Sith för att styra galaxen före Republiken (och Jedi-ordningen) omkastade dem. Denna handling är vad Sith tar hämnd för i Star Wars: Revenge of the Sith 
  “The Republic has fallen, Padmé,” Obi-Wan said gravely. “The Jedi
  Order is no more.” “I know.” Padmé gazed at him, seeing the new lines
  in his face. “It’s hard to believe.” She took a deep breath. “But the
  Senate is still intact. There is some hope.”
  
  “No, Padmé,” Obi-Wan said sadly. “It’s over. The Sith now rule the
  galaxy, as they did before the Republic.”
  
  Padmé stared. “The Sith?” It was Palpatine who was in charge of the
  Repub — of the Empire. Surely Obi-Wan didn’t mean that Palpatine was a
  Sith Lord!
  
  Revenge of the Sith: Official Novelisation
 Klonkrigen och Order 66 är "Siths hämnd" 
  [The] Clone Wars have always been, in and of themselves, from their very
  inception, the revenge of the Sith.
  
  They were irresistible bait. They took place in remote locations, on
  planets that belonged, primarily, to “somebody else.” They were fought
  by expendable proxies. And they were constructed as a win-win
  situation.
  
  The Clone Wars were the perfect Jedi trap.
  
  Revenge of the Sith: Official Novelisation
 och 
  A small hologram of the first of the clone commanders sprang up before him. “Yes, my lord?”
  “The time has come,” Darth Sidious said, savoring the words. After a thousand years, the time for revenge has come at last. “Execute Order Sixty-six.”
  
  Revenge of the Sith: Official Junior Novelisation
 Mace Windu ger oss denna insikt. Som du kan se var fallet av Darth Bane (och i förlängning  alla  nästan hela Sith) klart en vändpunkt i Jedi / Sith-relationerna: 
  “Since the fall of Darth Bane more than a millennium ago, there have
  been hundreds of thousands of Jedi-hundreds of thousands of Jedi
  feeding the light with each work of their hands, with each breath,
  with every beat of their hearts, bringing justice, building civil
  society, radiating peace, acting out of selfless love for all living
  things-and in all these thousand years, there have been only two Sith
  at any time.
  
  Revenge of the Sith: Official Novelisation
 För att backa upp det har du citat från Palpatine som Sith brukade regera galaxen. 
 
ochWinduangerattSithbrukadeförtryckamänniskor