A secret British spy unit created to mount cyber attacks on Britain's enemies has waged war on the hacktivists of Anonymous and LulzSec, according to documents taken from the National Security Agency by Edward Snowden and obtained by NBC News. The blunt instrument the spy unit used to target hackers, however, also interrupted the web communications of political dissidents who did not engage in any illegal hacking. It may also have shut down websites with no connection to Anonymous. A division of Government Communications Headquarters (GCHQ), the British counterpart of the NSA, shut down communications among Anonymous hacktivists by launching a denial of service" (DDOS) attack - the same technique hackers use to take down bank, retail and government websites - making the British government the first Western government known to have conducted such an attack. The documents ... show that the unit known as the Joint Threat Research Intelligence Group, or JTRIG, boasted of using the DDOS attack - which it dubbed Rolling Thunder - and other techniques to scare away 80 percent of the users of Anonymous internet chat rooms. Among the methods listed in the document were jamming phones, computers and email accounts and masquerading as an enemy in a "false flag" operation. A British hacktivist known as T-Flow, who was prosecuted for hacking, [said] no evidence of how his identity was discovered ever appeared in court documents.