Leaks reveal GCHQ infiltrated and attacked Anonymous
According to the slides, which were originally presented at a 2012 NSA conference, the spy agency deployed a distributed denial-of-service (DDoS) attack on the internet relay chat rooms used by Anonymous members in 2011. The agency also implanted malware to uncover their identities.
In addition to identifying and imprisoning a hacker who stole data from PayPal, the spying division exposed the hacker "p0ke" to authorities through an infected webpage that employees sent to him in a chat. He was never arrested, however.