 In addition to his highly successful publishing business, Gollancz was a prolific writer on a variety of subjects, and put his ideas into action by establishing campaigning groups.The Left Book Club was not only a book club run along commercial lines, but also a campaigning group that aimed to propagate left-wing ideas in Britain.The founding of the club marked the end of his career solely as a publisher, after which he devoted much of his energy to campaigning.