This comes from John Dean:
http://writ.news.findlaw.com/dean/ 1. The Intelligence Identities and Protection Act. This is the law that everyone's getting their knickers in a twist over -- what is "name"? what is "knowingly?"
2. "The Espionage Act of 1917, though thrice amended since then, continues to criminalize leaks of classified information, regardless of the reason for the leak. Accordingly, the "two senior administration officials" who leaked the classified information of Mrs. Wilson's work at the CIA to Robert Novak (and, it seems, others) have committed a federal crime." (
http://writ.news.findlaw.com/dean/20030815.html )
3. Federal Conspiracy Statute. "This elegantly simple law has snared countless people working for, or with, the federal government. Suppose a conspiracy is in progress. Even those who come in later, and who share in the purpose of the conspiracy, can become responsible for all that has gone on before they joined. They need not realize they are breaking the law; they need only have joined the conspiracy."
(
http://writ.news.findlaw.com/dean/20031010.html )
After the leak, and once a Grand Jury is convened, there's always a chance at perjury and obstruction of justice.