As for actual Nazi war criminals, it's hard to say because they burned many records before the Allies got to them, so historians aren't quite sure how many in the middling to higher ranks were never identified. A few years ago, there were about 8 still alive.
As for Neo Nazis, many would say one is too many. But quantitatively speaking, it's hard to find a reliable number because people who espouse the varied ideals that get lumped under that category are not always vocal or visible.
Answered Apr 30, 2011
Edited Apr 30, 2011