The Communist Party of Great Britain (CPGB) was founded in 1920 and aimed to promote Marxist-Leninist principles in the UK. It played a significant role in the labor movement and was involved in various social and political campaigns throughout the 20th century. The party sought to represent the working class and advocated for the establishment of a socialist society. Over the years, the CPGB faced internal divisions and external pressures, particularly during the Cold War. In 1991, the party dissolved, but its legacy continues through various leftist organizations and movements in the UK, including the Communist Party of Britain and Left Unity.