Which American journalist is the subject of the film "Good Night, and Good Luck"?

"Good Night, and Good Luck" is a 2005 American historical drama film directed by George Clooney. The film portrays the conflict between veteran radio and television journalist Edward R. Murrow and U.S. Senator Joseph McCarthy of Wisconsin, especially relating to the anti-Communist Senator's actions with the Senate Permanent Subcommittee on Investigations.

"Good Night, and Good Luck" focuses on the theme of media responsibility, and also addresses what occurs when the media offer a voice of dissent from government policy. The movie takes its title "Good Night, and Good Luck" from the line with which Murrow routinely signed off his broadcasts. The film is framed by a performance of the speech given by Murrow to the Radio and Television News Directors Association on October 25, 1958, in which he harshly admonishes his audience not to squander the potential of television to inform and educate the public, so that it does not become only "wires and lights in a box".