Secret psyops JTRIG group (part of the GCHQ), as revealed byEdward Snowden.

https://en.wikipedia.org/wiki/Joint_Threat_Research_Intellig...

Presentation Slides

https://theintercept.com/2014/02/24/jtrig-manipulation/

Very wide breadth and depth of the tooling used by JTRIG

https://www.schneier.com/gchq-catalog/

The Gentleperson's Guide To Forum Spies (Encyclopedia Esoterica)