Caroline Nelson (also Caroline Nelson Rave; 1868–1952) of Denmark was an American birth control advocate and radical socialist.[1] A member of Margaret Sanger's inner circle,[2] she was affiliated with the Northern California Birth Control Committee of 100.[3] As a San Francisco-based Wobbly organizer, she spoke at IWW meetings, along with Emma Goldman, Elizabeth Gurley Flynn, and Rose Pastor Stokes.[4] Nelson was married to Carl Rave, an ironworker and union activist who also participated in birth control activism.[5]