All The President’s Men in a 1976 political-thriller movie based on the book by Bob Woodward and Carl Bernstein about their experience reporting on the Watergate scandal which lead to the resignation of President Richard Nixon.

While Woodward and Bernstein weren't COMPLETELY responsible for the resignation of Nixon, (Sy Hersh with The New York Times also did valuable reporting!!!) Their book and movie preserve a really weird time in US history. The book/movie also demonstrates a pretty realistic depiction of working in journalism.

^Movie Woodstein^