This book meticulously examines the works of Karl Marx and Friedrich Engels (including numerous letters) to present their thoughts on communication and media studies from the perspective of "world intercourse" to reveal their spread in all areas of social information dissemination of ideas. The scope of the book ranges from language, writing and printing to newspapers, and from religion, literature and art, public opinion, and publicity to news, the communication revolution, communication policy, communication psychology, and the free exchanges of workers in the party. It is intended for readers with a college degree or above, especially those concerned about the dissemination of information and social interaction as well as intercourse.