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October 26, 2001

July 10, 2008

December 1, 2012

May 20, 2013

June 5, 2013

June 6, 2013

June 9, 2013

June 21, 2013

June 23, 2013

August 8, 2013

May 19, 2014

June 30, 2014

June 2, 2015

July 31, 2013

May 10, 2016

October 26, 2001 -- President George W. Bush signs the USA Patriot Act into law.

Caption by / Photo by JIM WATSON/AFP/Getty Images

July 10, 2008 -- President George W. Bush signs the FISA Amendments Act into law.

Caption by / Photo by Brendan Smialowski, Getty Images

December 1, 2012 -- Edward Snowden reaches out to Glenn Greenwald using the pseudonym "Cincinnatus," urging Greenwald to set up a secure communication channel. Greenwald ignores him and the two don't connect until Snowden appeals to Laura Poitras. Snowden and Greenwald begin communicating about NSA programs by April 2013.

Caption by / Photo by Andrew Burton, Getty Images

May 20, 2013 -- Edward Snowden flies to Hong Kong after taking a leave of absence from his job at Booz Allen Hamilton, a contractor to the NSA. Greenwald and Poitras followed soon after, as did Guardian investigative reporter Ewen MacAskill.

Caption by / Photo by Barton Gellman, Getty Images

June 5, 2013 -- The Guardian and The Washington Post publish reports on a secret court order requiring Verizon to hand over all customer call records.

Caption by / Photo by Spencer Platt, Getty Images

June 6, 2013 -- The Guardian and The Washington Post publish reports revealing the Prism program, which lets the National Security Agency grab people's emails, video chats, photos and documents from some of the world's biggest tech companies. The companies denied giving the NSA unfettered access to such data.

Caption by / Photo by NSA

June 9, 2013 -- Snowden goes public in a video posted to The Guardian website.

Caption by / Photo by Screenshot

June 21, 2013 -- Snowden turns 30 years old. The US Department of Justice unseals charges against him for violating the Espionage Act of 1917 and theft of government property

Caption by / Photo by James Martin

June 23, 2013 -- Snowden flees to Moscow, where he remains today.

Here, Snowden is shown on a livestream during the Right Livelihood Award ceremony at the Swedish Parliament on December 1, 2014. He was awarded the Right Livelihood Honorary Award for revealing the extent of state surveillance.

Caption by / Photo by PONTUS LUNDAHL/AFP/Getty Images

August 8, 2013 -- Lavabit, an encrypted email service used by Edward Snowden, ceases operations rather than allow the government to intercept and decrypt its users' messages.

Here, Lavabit founder Ladar Levison is interviewed by CNET News' Declan McCullough at CBS Interactive headquarters in San Francisco, Calif., on October 27, 2013.

Caption by / Photo by James Martin/CNET

May 19, 2014 -- Greenwald, Poitras and Ryan Devereaux, a reporter for The Intercept, report the NSA is recording every phone call in the Bahamas and another nation, but decline to name that country because they say it would incite violence. WikiLeaks founder Julian Assange says the unnamed country is Afghanistan, causing a public argument between The Intercept and WikiLeaks on Twitter.

Caption by / Photo by Google Maps

June 30, 2014 -- Admiral Michael S. Rogers tells The New York Times he has seen terrorist groups change communications tactics over the last year, but adds, "You have not heard me as the director say, 'Oh, my God, the sky is falling.'" Rogers was three months into his tenure as director of the NSA, replacing Keith Alexander.

Caption by / Photo by Chip Somodevilla, Getty Images

June 2, 2015 -- USA Freedom Act enacted. The law reauthorized many provisions of the Patriot Act, but introduced some limitations on bulk collections of phone records.

Caption by / Photo by Win McNamee, Getty Images

July 31, 2013 -- The Guardian publishes a report on the XKeyscore program, which allows NSA analysts to access a huge variety of Internet traffic by querying databases with email addresses, phone numbers and other search terms.

Caption by / Photo by James Martin/CNET

May 10, 2016 -- The US Senate Judiciary Committee debates Section 702 of the Foreign Intelligence Surveillance Act Amendments Act, which authorizes the Prism and upstream collection programs.

This gallery also appears in Spanish. Read: Edward Snowden y la vigilancia estatal en EE.UU.

Caption by / Photo by SAUL LOEB/AFP/Getty Images
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