That's an urban legend, only it is the Library of Congress, not The Smithsonian (I see that is has "morphed" over the years into The Smithsonia)...
this has been discussed before, but I can tell you with 100% confidence that it is an Urban Legend! Not to worry!
I copied and pasted this from a guy's webpage:
"
The Library of Congress finally came up with a reply after getting lots of inquiries:
"At the behest of a number of Greeks, I recently contacted the Library of Congress about the "secret ritual" issue. When I got through to general information they routed me to the reading room, where a kind lady cut me off before I could even finish my question, "...I already know what you're going to ask. It's not true. It's just a myth. We get this a lot."
She kindly agreed to send me a form letter that they send to everyone who writes in (or comes in) wanting to know where they can find all the fraternity rituals (except theirs of course). What they sent me was a very politely worded response indicating that they don't have secret college rituals in their collection"
http://mcrae.ca/greek/docs/loc.htm
http://greekchat.com/gcforums/showth...brary+Congress