They also did some anti-newsgroup operations like "Cancel Bunny" and Spambot.
Cancel Bunny tried to eliminate postings that Scn didn't like by using a hole in the protocol that allowed them to cancel the posting (even though they were not the poster).
This did NOT make regular newsgroup users happy with Scientology. In their effort to suppress negative info, OSA made increasing numbers of enemies among non-Scn Internet users.
Spambot tried to make newsgroups unreadable by flooding them with spam.
ADDING: And there's also the "net nanny", where Scientologists were persuaded to install software from a CD, supposedly to compose a Scientology homepage for themselves. Carried along was software which inserted itself into their PC, and blocked internet access to anti-Scn sites, or to sites containing certain keywords like Xenu.
CancelBunny and SpamBot!
I was running a Usenet server at that time.
CancelBunny made me reconfigure my server to ignore any cancels and any automated execution of systems messages, which taught me quite a bit about the underlying NNTP protocol and programming in general.
SpamBot together with numerous off topic posts made my killfile grow out of proportions and was the reason for me to finally kick ARS off of my server. Maintenance, administrative tasks and last but not least the incredibly long data transmission times did cost me way more than ARS was worth to me.
Soon thereafter, Internet had basically conquered every household in my neck of the woods, so I shut down my little local dial-up information business and my Usenet server as well.
Oh well, it was fun while it lasted.