Memex is a set of search tools that are better suited to government (presumably law enforcement and intelligence) use than commercial search engines. The project is the brainchild of the boffins at DARPA, the US government agency that built the internet (then ARPANET) Memex will eventually have a very broad range of applications, the projects initial focus is on tackling human trafficking and slavery. The US Department of Defense is developing an experimental search tool to help catch and lock up human traffickers.”]
Source: https://nakedsecurity.sophos.com/2015/02/16/memex-darpas-search-engine-for-the-dark-web/