If you type in "John N. Mitchell" into Google the number one in the ranking is a very brief page from Wikipedia.
http://en.wikipedia.org/wiki/John_N._Mitchell
I wonder why that is. I have added a link to the more detailed Spartacus biography. Let us see how long it stays there.
http://www.spartacus.schoolnet.co.uk/JFKmitchellJ.htm