Hello, coming in as a sort of causal historian. I am looking to learn more about Sithism and Sith Realism groups past and present. Finding any information on different groups is sort of like chasing ghosts so any help in getting more info would be helpful.

These are the Groups I'm aware of:
The Sithist Cabal (2007 - 2010, 2010 - c.2020)
Order of the Sith (2006 - )
Sithism (2002 - 2005)
The Sith Order of Dark Matter (2018 - )
The New Sith Order (2013 - ?)
Church of Sithism (2013 - )
Order of the Sith 2nd (2016 - 2019)
Sith Empire (2007)
Order of the Suns (Originally Bogan Academy, 2007 - ?)
The Modern Sith (?, came across name only)
Sith Order (Reddit) (2013 - )

Any details you have would be helpful