In 1998 Hacker-Poet-Artist Yucef Mehri breached the security of CANTV at the time the largest telecommunications company in Venezuela. He was able to access the personal data kept by the company which contained the names, addresses, phone numbers, working places, and even checking accounts, credit cards, and expiration dates of it's customers.
Anonymous (used as a mass noun) is a loosely associated hacktivist group. It originated in 2003 on the imageboard 4chan, representing the concept of many online and offline community users simultaneously existing as an anarchic, digitized global brain.