President Barack Obama campaigned on a pledge of expanded government transparency, yet his administration has charged more Americans with violating the Espionage Act by leaking classified information than all previous administrations combined.

Eight Americans have faced charges since 2008 under the nearly 100-year-old act.

"Leaks related to national security can put people at risk," Obama said earlier this year. "I make no apologies and I don't think the American people will expect me as commander in chief not to be concerned about information that might compromise their missions or get them killed."

Here's a look at the people charged during Obama's administration with leaking information under the Espionage Act: