The U.S. and U.K. track phone calls and Internet usage extensively
The first revelation from the Snowden files came on June 5, 2013, courtesy of the Guardian newspaper. That initial story revealed how extensively the NSA tracked phone calls, even of U.S. citizens -- contradicting the NSA's earlier statements to Congress that only noncitizens were targeted. Later, it was revealed that the NSA relied on spy agencies such as Britain's GCHQ to spy on Americans on its behalf where the law prevented the NSA from doing so directly.
Several federal judges called the NSA program unconstitutional, President Barack Obama ultimately called for its scope to be reduced, and the U.S. House of Representative passed a bill limiting NSA phone tracking, though the Senate has not yet acted.
At the Guardian: The NSA files