I'm trying to build a character around it and not sure. Kind of like a secret society that makes all the moves undercover for the empire like political assassinations and who is in charge of power.

Yup. Blades.

Role play it son.

no besides the blades kinda of like the dark brother hood but just for imperials. I guess your right i should just role play a back story

Aren't they more personally dedicated to the Emperor though? Rather than being an 'Imperial' force per se?