The internet security firm that was hacked by Anonymous and had it's internal emails and memos leaked to public. Anonymous helped reveal that the company was illegally targeting journalists sympathetic to Wikileaks and selling the US Government illegal hacking tools such as rootkits and other malware. In addition, the emails showed they were being hired by Bank of America to target Wikileaks itself with online attacks. The CEO had to resign because of the scandal generated by the emails.
HB Gary threatened Anonymous
Anonymous completely owned HB Gary, tapping their phones, stealing their emails and databases, deleting their back-ups and wiping out the CEO's I-pad and hacking his Twitter account.
Don't fuck with Anonymous