In June 2013, Edward Snowden burst onto the world media scene. He had worked as a contractor for the National Security Agency and collected a vast quantity of top-secret documents. Snowden leaked the documents to the Guardian, a well-known British newspaper and media group, revealing that the NSA had been secretly carrying out extensive spying on electronic communications. Snowden quickly became one of the world's best known whistleblowers. As well as extensive commentary in the mass and social media, several major books have been published about him and his revelations.