In the spring of 2010,  Army intelligence analyst Private First Class Bradley E. Manning purportedly handed over the largest cache ever of classified documents to the internet activist and hacker, Julian Assange.  Private Manning allegedly leaked the trove hoping to incite “worldwide discussion, debates, and reforms.”    In WikiSecrets, FRONTLINE follows the trail of both Manning and Assange to uncover the truth behind the leaks. Veteran Correspondent Martin Smith also talks to the major players in the case and explores the issues at stake–from free speech to cyber security, and reports on the U.S. government’s struggle to protect national security information and the dilemma posed by the need to increase information-sharing in a post 9-11 world.