Securing Human Intelligence and Enforcing Lawful Dissemination Act or the SHIELD Act - Amends the federal criminal code to expand the prohibition against disclosure of classified information to include: (1) disclosures of classified information that benefit a transnational threat; and (2) any classified information concerning the human intelligence activities of the United States or any foreign government or concerning the identity of a classified source or informant of an element of the U.S. intelligence community.
Defines "transnational threat" as: (1) any activity, including international terrorism, narcotics trafficking, the proliferation of weapons of mass destruction and the delivery systems for such weapons, or organized crime, that threatens the national security of the United States; or (2) any individual or group that engages such activity.