Gary Lachmann, of Blondie, has this great book on rock and roll, the 60's counterculture and the occult. Has a chapter on Tolkien.
Turn Off Your Mind : The Mystic Sixties and the Dark Side of the Age of Aquarius by Gary Lachman (Author)
Euro-fascists into Tolkien, Campo Hobbit. http://www.geocities.com/CapitolHill/6890/