Suprising quotes in the LOTR

Originally Posted by ninja91

No. N-O. And even if they did, it was because they were captured prisoners, because there were no elves that served him, at least not knowingly into evil.

N-O??? Are you preaching Chemistry here?

Can someone ellaborate more on what Gandalf said to Frodo about many a king & others that have walked Middle-Earth & are yet under the sway of the Dark Lord?