Rowley's support for WikiLeaks stems from its function as an outlet for potential whistle-blowers in the national intelligence section of the federal government who have no avenue to share information without fear of reprisal. Currently, there is no federal law protecting those who would reveal illegalities like fraud, waste, abuse or threats to public safety.
http://www.rawstory.com/rs/2010/12/exclusive-wikileaks-benefits-public-intelligence-officers