There are 4 unique codex entries in the Organizations section on Hoth. 3 are accessible to all players regardless of class or faction and 1 is class specific.
Chiss Ascendancy is obtained from interacting with Clickable Junk.
Codex type: Organizations | Faction: Both | Class: All
Associated Achievement: None
Chiss Expansionary Defense Force (Agent) is obtained from speaking with Ensign Temple during "Frigid Expedition" mission.
Codex type: Organizations | Faction: Imperial | Class: Imperial Agent
Associated Achievement: None
The Hailstorm Brotherhood is obtained from killing Master Sav during "Razing the Ice Fortress" mission as an Imperial player or "Give them an Inch" mission as a Republic player.
Codex type: Organizations | Faction: Both | Class: All
Associated Achievement: None
The White Maw Pirates is obtained from interacting with a Clickable Crate.
Codex type: Organizations | Faction: Both | Class: All
Associated Achievement: None