British intelligence ran denial-of-service attacks against chatrooms used by Anonymous and LulzSec, according to an investigation by NBC News involving Snowden confidante Glenn Greenwald.
Documents leaked by the NSA whistleblower record how a GCHQ unit known as the Joint Threat Research Intelligence Group, or JTRIG, used a packet flood operation dubbed Rolling Thunder to "scare away 80 per cent of the users of Anonymous internet chat rooms," NBC reports.

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