Novelist and social reformer. Married Grace Hegger (date), divorced, one son; married Mary Craig Kimbrough (?) children? A muckraking reformer, Sinclair was best known for his novels most notably The Jungle (1906), an expose of the meat-packing industry and Metropolis (1908), a portrait of urban vice in New York City. A Socialist Party member, he also contributed articles to such socialist magazine, The Comrade and the International Socialist Review and gave lectures on socialist theory at the Ferrer Center. Sinclair met Margaret Sanger in 1911 shortly after she moved to New York City and joined the New York Socialist Party local. An advocate of women's economic equality, Sinclair supported birth control. After Sanger's indictment for The Woman Rebel and William Sanger's arrest for distributing a copy of Family Limitation, Sinclair wrote an open letter of support that was printed in The Masses. Sinclair was also the author of Love's Pilgrimage (1911) and American Outpost: A Book of Reminiscences (1932).