The Loyalist Red Scorpions Chapter of Space Marines is known to be composed of conservative Imperial purists who are famed for their complete and utter devotion to Imperial doctrine, past the point where pragmatism or even reason would seem to require otherwise. The Chapter is most renowned among other Astartes for their absolute adherence to every line of the Codex Astartes, which is unheard of in any other Chapter -- including the Ultramarines. Their recorded history extends across five millennia, but there are numerous indications that it may extend further than that. Due to their history of conflict with the Forces of Chaos, they refuse to deal with any xenos species or any humans that they consider as tainted by mutation of any kind, even Imperially-sanctioned Abhumans like the Ogryns