[@Jbcool] Uh, boss, I think you got something mixed up....

The [url=http://wh40k.lexicanum.com/wiki/Emperor's_Children]Empoeror's[/url] [url=http://warhammer40k.wikia.com/wiki/Emperor%27s_Children]Children[/url] are [url=https://1d4chan.org/wiki/Emperor%27s_Children]Chaos[/url] aligned. As said on Lexicanium, quote,
"All trace of decency amongst the Emperor's Children had vanished by the time they partook in the Siege of Terra. While other Traitor Legions assaulted the Imperial Palace, the Emperor's Children embarked upon a spree of terror and gratification amongst the helpless citizenry of Terra. Millions of defenseless civilians were slaughtered and rendered down to create endless varieties of drugs and stimulants, countless thousands more dying to provide the Legionnaires with more direct and cruder pleasure."

NO ONE loyal to the imperium would ask them for help. Ever.