Siths are Jedi Knights who have given themselves over to the Dark Side by embracing the evil emotions of anger, envy, and revenge.
"Readers of Commentary can be forgiven for neither knowing nor caring about this. But it is worth noting that for millions of Star Wars enthusiasts, it was very serious stuff indeed.
And Lucas threw it all away to get in a dig at George W. Bush."
The word “Sith“ is plural already and not all Sith used to be Jedi, some are raised evil like Darth Maul and Darth Talon. But anyway great article.