Cthulhu aka Thomas White is a British Tor hidden service developer and administrator.
Activities involved being consulted on a number of Tor security matters such as dark web scams, law enforcement raids and darknet markets.
He has hosted a number of data dumps including those associated with Hacking Team, Ashley Madison, and Patreon.
In January 2016 he hosted a release of the files hacked from the Fraternal Order of Police.
References
Cthulhu (developer) Wikipedia(Text) CC BY-SA