Marine Corps. Major Caught Sending Classified Documents to Superiors Using Personal Email: Maj. Jason Brezler was dismissed from the Marine Corps when he “accidentally took home 14 documents on his personal computer, some of which were classified.” According to the report, Brezler was “in a graduate school class when he received an urgent email from military officials in Afghanistan and sent a specific document in response, using his personal email account.”
One other one didn't lead to prosecution, but loss of job and clearance:
State Department Official Fired and Security Clearance Revoked After Linking to Classified Wikileaks Document: Peter Van Buren, a foreign service officer for Hillary’s State Department, was fired and his security clearance revoked for quoting a Wikileaks document AFTER publishing a book critical of Clinton. In fact, the Washington Post reported that one of his firing infractions was “showing ‘bad judgement’ by criticizing Clinton and then-Rep. Michele Bachmann on his blog.”
There is another one that is less clear in that article. Classified information was found on a work computer at the guys house, unknown if accidental or intentional, and he was pardoned for it as he was chummy with Bill Clinton.