What does the Nazgul in The Lord of the Rings represent?

Answer 1

It doesn't really represent anything. Tolkien didn't want people to think that the books represented what was really happening because he wanted his books to be complete fantasy and enjoyment, of course you can relate to certain happenings in the books and movies but there was never any intention for this.

Answer 2

"Nazgul" is another name for the Ringwraiths. The Ringwraiths are black, hooded and cloaked figures, with poor eyesight but a keen sense of smell. Their faces are masked. They ride huge black horses and then, later, large winged creatures called Fell Beasts. Ringwraiths hate fire and water and other kinds of nature. The Ringwraiths were once men, the nine fallen kings who bear the rings given to men. They were seduced and corrupted by Sauron and now serve him. When Frodo puts on the Ring they appear to him as skeleton kings. Their leader, the Witch King, stabbed Frodo on Weathertop after he and the other Wraiths had been pursuing the four hobbits and Aragorn. The Witch King was destroyed by Eowyn and Merry in the Battle of the Pelennor Fields, fulfilling Glorfindel's prophecy that he was not to fall by the hands of men. The others fell with Sauron when the Ring was destroyed. -sam-is-my-hero-

Answer 3

the darkness and corruption in Sauron's heart