Order 66

Order 66, also known as Clone Protocol 66, was a top secret order identifying all Jedi as traitors to the Galactic Republic and, therefore, subject to summary execution by the Grand Army of the Republic. The order was programmed into the Grand Army clone troopers through the control chips implanted in their brains, making it impossible for the clones to disobey the command to turn against their Jedi Generals. In secret, Order 66 was the means by which the Sith intended to bring about the fall of the Jedi Order.

Jedi around the galaxy were portrayed as traitors to the Grand Army of the Republic and their once fellow clone troopers turned on them killing nearly every Jedi. Many Jedi perished, but some Jedi such as Denber Harpin and Jade.