“NBC News has published new documents from the National Security Agency trove provided by former NSA contractor Edward Snowden. The latest revelation is that British intelligence agency GCHQ conducted a covert campaign against Anonymous in September of 2011, crippling one operation by the hacktivist group and unmasking several of its members. The slides indicate that the GCHQ infiltrated the Internet relay chat (IRC) for Operation Payback, a collective ‘op’ by hackers affiliated with Anonymous that targeted PayPal, MasterCard, and Visa after they stopped electronic donations to WikiLeaks.
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Source:GCHQ brought down several Anons using their own medicine | Ars Technica