Forbes: Over the weekend, the hacking group LulzSec broke into the networks of FBI affiliate Infragard and stole the login credentials for about 180 people who use its website. LulzSec says that one of those users, Karim Hijazi of Unveillance, bargained with them to eliminate his competitors. Hijazi disputes that statement, saying, "the FBI was involved from the first minute I was able to get someone on the phone."
The same group was behind attacks at PBS, Fox.com and Sony. They also attacked Nintendo over the weekend.