Edward Snowden went from obscurity to an internationally known figure overnight. It was all because of his whistleblowing activities.
He is widely considered the most famous whistleblower in American history. He copied and leaked highly classified information from the National Security Agency in 2013. At the time, he was a Central Intelligence Agency employee and subcontractor.
The leaked information showed all the ways governments are spying on their own citizens. Of course, the focus was on America. Since then, he has left America, and is now living in Russia. His asylum in Russia is part of the aftermath from the global surveillance disclosures made by him.
In this video, he talks about cell phones, and how governments can and will use them to spy on people.