[member="Abomz"]
The One Sith is an entirely Sith-ran organization that is led by a single Dark Lord of the Sith (Think of a Darth Sidious or Darth Krayt variant) that communicates to his subordinates through the Voices of the Dark Lord (there are five of those). The Voices are given sectors of the galaxy to spread his influence to and control, such as I being in charge of the galactic core worlds, inner rim, and mid rim. Those whom amount to his generals are known as the Hands of the Dark Lord (I believe there are two of those), and they carry out his will directly through battle, assassination, diplomacy, etc. Within the OS if you are Knight or above in terms of force user rank or NFU equivalent (each faction has their own NFU rank scale) then you are considered equals, with the Voices and his Eye (basically his strategist and such) being "first among equals". Contrary to popular belief, you needn't be a force user to become a Voice (as we have a non-force user as one, and have had a Yuuzhan Vong in the past as one) or a hand, or to succeed in the faction.
We are absolutely nothing like the Sith Empire of this board's past or Galactic Empire, regardless of what others wish for us to become (being an "empire" by category does not immediately make you the same archetype). We are a bit closer to the empire of Marka Ragnos if anything, as far as how control is distributed.