They're not.
Note to everyone on this post: For the love of God, please do not compare this potboiler tripe to the work of J.R.R. Tolkien. Tolkien was a scholar and a poet. The ding-bat broad who wrote these books is...well, just that -- a ding-bat.
Torture!
I tend to agree with our interrogators on the efficacy of this method. After a few chapters, I'd be singing like a canary.
Gandalf (Olorin) and the other Istari are of the order of Maiar. Sauron in his origin was a Maia of Aule.
I'm reading The Silmarillion now, for the umpteenth time. Gotta have something to look at until Friday at midnight!