Citizenfour is a 2014 documentary film directed by Laura Poitras, concerning Edward Snowden and the NSA spying scandal. The film had its US premiere on October 10, 2014, at the New York Film Festival and its UK premiere on October 17, 2014, at the BFI London Film Festival. The film features Snowden and Glenn Greenwald, and was co-produced by Poitras, Mathilde Bonnefoy, and Dirk Wilutzky, with Steven Soderbergh and others serving as executive producers. Citizenfour received critical acclaim upon release, and was the recipient of numerous accolades, including Best Documentary Feature at the 87th Academy Awards. This film is the third part to a 9/11 trilogy following My Country, My Country (2006) and The Oath (2010). Citizenfour uncovers the secret and illegal practices of the U.S. National Security Agency's mass surveillance programme using classified documents revealed by NSA whistle-blower Edward Snowden.It aims to shed light on the indiscriminate invasion of the privacy of American citizens as well as those of other countries carried out by the NSA in a case that the shocked the world.