Is the NSA Really Preventing Terrorist Attacks?
The agency, President Obama, and members of Congress have all said NSA spying programs have thwarted more than 50 terrorist plots. But there’s no evidence the claim is true.
Justin Elliott and Theodoric Meyer
Who's Hiding What? 5 Basic Things We Still Don't Know About the NSA's Snooping
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.