<< Politically they were nuetral but not in regards to the force. Also, the only other dark jedi arround when Darth Vader went on his spree were clones. There can be only 2, a master and his apprentice.
And there are not many books that go into detail about pre clone or even pre deathstar stuff. Zahn is the only author with the real skill to go into that relm.
Dark Jedi code:
There is no peace, ther is anger
there is no fear, ther is power
ther is no death, there is immortality
there is no weakness, there is the darkside. >>
Okay, before the fall of the Sith, the creed about there only being two did not exist. I'm reading the book right now that set that creed in place. Darth Sidious, being the last surviving Sith, made that rule. At the hight of the Sith, there were many of them. But, yes, Vader came way after Darth Sidious's fathering the new Sith and it's new code and Sidious's apprentice.
nik