There are 8 unique codex entries in the Organizations section in Space. They are class specific.
Adasca BioMechanical (Bounty Hunter) is obtained from interacting with the Intercom during "Honor or Glory" mission.
Codex type: Organizations | Faction: Imperial | Class: Bounty Hunter
Associated Achievement: None
Children of the Emperor (Consular) is obtained from interacting with the Intercom during "To Serve the King" mission.
Codex type: Organizations | Faction: Republic | Class: Jedi Consular
Associated Achievement: None
Rift Alliance Coalition Forces (Consular) is obtained from interacting with the Intercom during "The Coalition" mission.
Codex type: Organizations | Faction: Republic | Class: Jedi Consular
Associated Achievement: None
The Emperor's Fallen Jedi (Knight) is obtained from speaking with Warren Sedoru during "Irredeemable" mission.
Codex type: Organizations | Faction: Republic | Class: Jedi Knight
Associated Achievement: None
The GenoHaradan (Bounty Hunter) is obtained from interacting with the Intercom during "No Strings Attached" mission.
Codex type: Organizations | Faction: Imperial | Class: Bounty Hunter
Associated Achievement: None
The Ghost Cell (Agent) is obtained from interacting with the Holoterminal during "The Spy Dance" mission.
Codex type: Organizations | Faction: Imperial | Class: Imperial Agent
Associated Achievement: None
The Rift Alliance (Consular) is obtained from interacting with the Intercom during "An Alliance of Opposites" mission.
Codex type: Organizations | Faction: Republic | Class: Jedi Consular
Associated Achievement: None
The Safecrackers (Trooper) is obtained from interacting with the Holoterminal during "Den of Thieves" mission.
Codex type: Organizations | Faction: Republic | Class: Trooper
Associated Achievement: None