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.
The NSA's eavesdropping and data-gathering may be unsettling, but it's only recently that we've begun to think of our telephone conversations as personal and private.
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.