This podcast discusses John Foster's book, 'Languages of Class Struggle', focusing on the theoretical debates within Marxism regarding language, communication, and mobilization in the context of class struggle. The conversation explores the historical significance of communication in mobilizing the working class, particularly through examples from the British and Irish labor movements. Key themes include the Marxist approach to communication, the role of Soviet theorists, the impact of Stalinism, and the practical struggles of the Upper Clyde Shipbuilders in overcoming sectarian divisions to unite workers against government policies.