In Star Wars: The Clone Wars, S2E3 Children of the Force, Sidious plans to kidnap Force sensitive children to create an army of dark side spies:
The natural talent these children possess is too great to be wasted by the Jedi. I foresee an army of Force-talented spies in my service, trained in the dark side to peer into every corner of the galaxy from afar. And my enemies would be helpless against such vision.
In the episode his plan is foiled. The children are saved and the holocron with the names and locations of the children is recovered.
However immediately after the Clone Wars, Sidious has no real resistance to stop him picking up this plan again.
My question is, does Sidious ever create an army of dark side spies as he planned in Children of the Force?