8. Chelsea Manning
No list of whistleblowers would be complete without mentioning the haul of hundreds of thousands of classified documents that were made public by intelligence analyst Chelsea Manning mainly via WikiLeaks in 2010.
Far-ranging in their exposure, the documents provided damaging insights into various incidents from the 2007 airstrikes on Baghdad to the Iraq and Afghanistan wars.
A range of correspondence from U.S. diplomatic missions was also leaked into the public domain which highlighted intelligence gathering on then-UN Secretary Generals Ban Ki-moon and Kofi Annan, as well as War on Terror policies.