"The Copper Badge: A Study of American Journalism" is the leading work of the famous American writer Upton Sinclair. In this book, the author examines journalistic ethics and practices, exposing the dark side of the American media. Sinclair exposes the influence of media owners on news content, highlights the corruption and propaganda that exists in journalism. The book is a powerful call for critical thinking and openness about the information we consume through the media. "Copper Badge" leaves the reader thinking about the importance of objectivity and truthfulness in journalism in today's world.