Glenn Greenwald (dark suit) and Noam Chomsky speak to an audience at the First Parish Church in Harvard Square for a Harvard Book Store author event  in Cambridge, Massachusetts, USA. The event was part of a book tour for Greenwald's recently released book, No Place to Hide: Edward Snowden, the NSA, and the U.S. Surveillance State. Chomsky is a well-known linguist, professor at MIT, and writer on political topics. Greenwald is a lawyer, blogger, writer, and journalist, known most recently for his role in the Snowden NSA leaks. Greenwald recently received a Polk Award for National Security Reporting, and the 2014 Pulitzer Prize for Public Service.