Rep. Alexandria Ocasio-Cortez in her Capitol Hill office. Claire Harbage/NPR hide caption

Whistleblowers have been reporting wrongdoing in government institutions since the late 1770s. But it has always been risky. Samuel Corum/Getty Images hide caption

Plácido Domingo on stage in July. Domingo was scheduled to perform at New York's Metropolitan Opera on Wednesday but withdrew following accusations of harassment. Christophe Simon/AFP/Getty Images hide caption

Audrey Hepburn appears as Eliza Doolittle in My Fair Lady. In a letter to director George Cukor, she raved about the script. AP hide caption

Salmon swim upstream in Seattle in 2017. A mass of abnormally warm water off the west coast of the U.S. that year contributed to a federal fishery disaster. Warming oceans and rising sea levels are threatening coastal economies as the world's climate changes. Elaine Thompson/AP hide caption

Rep. Brian Mast, R-Fla., and other members of Congress are appealing a decision by the Department of Veterans Affairs to evict them from office spaces at VA hospitals. J. Scott Applewhite/AP hide caption