The FBI's obsession with John Lennon in the late 60's and well into the 1970's has been well documented.  One of the documents in the file the agency compiled while keeping tabs on the former Beatle that was slated to go to with a minimum opening bid of $100k this weekend won't. Agents seized a fingerprint sheet of Lennon that was inked when he filed for US citizenship in 1976.  The agency was granted a subpoena to take possession of the card from the auctioneer shortly after it was displayed to the media Wednesday (10/6).  The print form had been in the collection of an unidentified concert promoter for the last 20 years, after turning up for sale at a Beatles fan convention. 
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