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Mary Margaret Garman Campbell (1898–1979) was the eldest of seven sisters known for their glamorous, bohemian lifestyles and their many love affairs with famous artists, writers, and musicians of interwar London. She was a member of the Bloomsbury Group and the wife of the radical South African poet Roy Campbell, who attacked the group in The Georgiad (1931), a response to his wife's lesbian affair with Vita Sackville-West.