E. P. Thompson was one of the great social historians of the twentieth century (link, link). He was also a committed socialist from youth to the end of his life. His 1963 book, The Making of the English Working Class, transformed the way that historians on the left conceptualized “social class”, and it was one of the formative works of "history from below". Thompson was a member of the British Communist Party (CPGB) until 1956, following the Soviet invasion of Hungary and Nikita Khrushche...