In Oceania, The Ministry of Truth is in charge of gathering information, destroying it, and distributing propaganda. In the United States, the National Security Agency is seen as a real life example.
In 2013, Edward Snowden distributed over 12,000 classified NSA documents detailing the surveillance and information gathering methods secretly used by the government.
FRONTLINE: United States of Secrets Part 1--The Program
FRONTLINE: United States of Secrets Part 2--Privacy Lost