This study examines John McGrath as a pioneering figure in British socialist theatre, renowned for using drama to critique social and political issues. McGrath sought to provoke thought and action against inequalities by addressing the struggles of marginalized populations. This paper focuses on his seminal work, The Cheviot, the Stag, and the Black, Black Oil (1973), which is pivotal in socially committed theatre. The play vividly portrays Scottish history, intertwining historical narrative with political analysis to explore economic and social inequalities. It highlights McGrath’s influence on contemporary theatre through his innovative approach and socialist stance. The paper delves into the thematic concerns and narrative structure of the play, emphasizing its impact on discussions of class, power, and identity, and its enduring relevance in modern theatre.