I know people who were convinced that these book sellers were actually a government sting operation. Since I thought the info found in most of these books was mostly bullshit, I guessed that the gov really didn't give a fuck. Seems I guessed correctly. FBI releases files on controversial booksellers Paladin and Loompanics <Click

The FBI has released its files on two famously controversial publishers, Paladin Press and Loompanics Unlimited, following a FOIA request filed by Government Attic. The files suggest that the booksellers' huge libraries of books on drugs, guns and other ultra-libertarian issues only rarely drew the FBI's attention.