The FBI raided the offices of Steve Jackson Games because Loyd Blankenship, the author of GURPS Cyberpunk, was the subject of a crackdown for disseminating a (largely non-technical) document about the E911 system on his BBS.

https://en.wikipedia.org/wiki/Steve_Jackson_Games,_Inc._v._U...

You made me feel old. As others commented before, the documents at stake were released int he Phrack magazine (which had a HN article some days ago because of a new issue).

The E911 article is:

http://phrack.org/issues.html?issue=24&id=4#article

The funny thing is that after all the noise the FBI and government made, it was found that the same document was kind of publicly available (or easily obtainable by anyone).

Good times those :)