kerkko.fi

This [Congressional Research Service] report identifies some criminal statutes that may apply [to dissemination of classified documents], but notes that these have been used almost exclusively to prosecute individuals with access to classified information (and a corresponding obligation to protect it) who make it available to foreign agents, or to foreign agents who obtain classified information unlawfully while present in the United States.

Leaks of classified information to the press have only rarely been punished as crimes, and we are aware of no case in which a publisher of information obtained through unauthorized disclosure by a government employee has been prosecuted for publishing it. There may be First Amendment implications that would make such a prosecution difficult, not to mention political ramifications based on concerns about government censorship.

http://www.eff.org/deeplinks/2010/12/information-antidote-fear-wikileaks-law-and-you