Famous whistleblowers
W. Mark Felt
Ultimately, Felt's devastating leaks as The Washington Post's secret Watergate source helped undermine Nixon's presidency.
Read more: W. Mark Felt, "Deep Throat," Dies At 95
Bradley Manning
Read more: Bradley Manning dumped info into enemy hands, prosecutor says
Sherron Watkins
Watch:Eye To Eye: Former Enron VP
Frank Serpico
Coleen Rowley
Linda Tripp
Dr. Jeffrey S. Wigand
Watch more:Wigand: 60 Minutes' Most Famous Whistleblower