If you downloaded the privacy software Tor in 2011, you may have been flagged to be spied on.
Disclosures by the spy agency about violations of privacy rules have been almost entirely redacted.
The White House has opposed efforts to rein in NSA snooping, but only five years ago, Senator Obama supported substantial reforms.
In a secret effort, the National Security Agency appears to be vacuuming up large swathes of the Internet.
In their book Cypherpunks, Julian Assange and three other Internet activists predicted much of what Edward Snowden revealed about the NSA.
Looking at 20 years of jihadist plots in the West, a leading expert on terrorism finds that Internet surveillance has its uses but is no panacea.
Has the NSA been collecting all Americans' phone records, what surveillance powers does the government believe it has under the Patriot Act, and other unanswered questions.
Prism and the NSA’s phone tapping programs were supposed to be emergency measures designed to combat terrorism. But what happens when the threat of terrorism is the norm?
Surveillance in the name of intelligence gathering is nothing new. Here's a look back at significant developments over the past 30-plus years.