Daniel Ellsberg was not a film actor; he was a former U.S. military analyst and whistleblower known for releasing the Pentagon Papers in 1971, which exposed government secrets about the Vietnam War. His actions significantly impacted public opinion and U.S. policy. Ellsberg's story was the subject of various documentaries and films, highlighting his role in advocating for transparency and accountability. He authored several books and remained an influential figure in discussions on government secrecy.