the surface web and deep web. Many users access the dark web for legitimate purposes, including the discussion of socially sensitive matters or to counter censorship in oppressive areas of the world. However, the dark web is also used to engage in illegal activities. Given the difficulty of enforcing the law on this global and largely anonymous platform, investigating illicit dark web activity is both a priority and challenge for the Federal Bureau of Investigation (FBI) and the Department of Justice (Department)."

"An Anatomy of the Internet"