Inside the Dark Web https://www.youtube.com/watch?v=fTjNkbLBEqg&feature=player_embedded
The first aspect of the conversation examined by the film is Britain's GCHQ - The Government Communications Headquarters - which is a federal security agency whose mission statement reads "[The Agency] is constantly working to keep Britain safe and secure in the challenging environment of modern communication." The reason cited in the film as being the sole one the public has any knowledge of the agency's existence is because Edward Snowden leaked the information in his infamous documents.