Upton Sinclair considered himself a poet and dedicated his time to writing poetry. In 1904, Sinclair spent seven weeks in disguise, working undercover in Chicago's meatpacking plants to research his novel, "The Jungle" (1906), a political exposé that addressed conditions in the plants, as well as the lives of poor immigrants. When it was published two years later, it became a bestseller. In the spring of 1905, Sinclair issued a call for the formation of a new organization, a group to be called the Intercollegiate Socialist Society.