There are 9 unique codex entries in the Organizations section on Belsavis. 2 are accessible to all players regardless of class or faction, 3 are faction specific, and 4 are class specific.
Belsavis Prisoners is obtained from interacting with a Clickable Corpse.
Codex type: Organizations | Faction: Both | Class: All
Associated Achievement: None
Dagger Wing (Trooper) is obtained from speaking with Torbin Harlan during "Change in Plans" mission.
Codex type: Organizations | Faction: Republic | Class: Trooper
Associated Achievement: None
New Men is obtained from speaking with Captain Rago during "A Pertinent Find" mission.
Codex type: Organizations | Faction: Imperial | Class: All
Associated Achievement: None
The Circle (Inquisitor) is obtained from speaking with Bolan during "Prison Break" mission.
Codex type: Organizations | Faction: Imperial | Class: Sith Inquisitor
Associated Achievement: None
The Condemned is obtained from speaking with Assistant Warden Graal during "Riot in the Warden's Station" mission.
Codex type: Organizations | Faction: Republic | Class: All
Associated Achievement: None
The Dread Masters is obtained from speaking with Commander Calum during "Terror in the Flesh" mission.
Codex type: Organizations | Faction: Imperial | Class: All
Associated Achievement: None
The Followers of the Hallow Voice (Consular) is obtained from interacting with the Stasis Vault Door during "The Voice from the Tomb" mission.
Codex type: Organizations | Faction: Republic | Class: Jedi Consular
Associated Achievement: None
The Imperial Guard is obtained from speaking with Lord Medechas during "Riot on Belsavis" mission.
Codex type: Organizations | Faction: Both | Class: All
Associated Achievement: None
The Scourge (Smuggler) is obtained from speaking with Amikab during "Most Wanted" mission.
Codex type: Organizations | Faction: Republic | Class: Smuggler
Associated Achievement: None