[One spy unit is] responsible for some of the United Kingdom's most controversial tactics of surveillance, online propaganda and deceit. Documents ... demonstrate how the Joint Threat Research Intelligence Group (JTRIG), a unit of the signals intelligence agency Government Communications Headquarters (GCHQ), is involved in efforts against political groups it considers "extremist". Though its existence was secret until last year, JTRIG quickly developed a distinctive profile [after] Edward Snowden revealed that the unit had engaged in "dirty tricks" like deploying sexual "honey traps" designed to discredit targets, launching denial-of-service attacks to shut down Internet chat rooms, pushing veiled propaganda onto social networks and generally warping discourse online. Particularly revealing is a fascinating 42-page document from 2011 detailing JTRIG's activities. The document lays out the tactics the agency uses to manipulate public opinion, its scientific and psychological research into how human thinking and behavior can be influenced. Many GCHQ documents describing the "missions" of the "customers" for which it works make clear that the agency has a wide mandate far beyond national security, including providing help on intelligence to the Bank of England, ... to various departments on agriculture and whaling activities, to government financial divisions to enable good investment decisions. Beyond JTRIG's targeting of Anonymous, other parts of GCHQ targeted political activists deemed to be "radical," even monitoring the visits of people to the WikiLeaks website. [The document] includes detailed discussions of how to foster "obedience" and "conformity".