A great deal of critical attention has been paid to naturalism in fiction, not as much has been paid to the movement's impact on poetry, perhaps in part because naturalist poets themselves appeared most successful in other genres, especially fiction and social science. The most important and influential American naturalist poets, Charlotte Perkins Gilman, Edwin Markham and Stephen Crane, were writing for a popular press, with the line between muckraking journalism and poetry at times significantly blurred. Gilman's politics build on a foundational naturalism: while individuals are controlled by their environment, she also believes that that environment is susceptible to change. Also like Gilman, Markham became widely famous for a single blockbuster poem. Crane's naturalism is on full display, as his speaker finds himself in a world where man is beast, caught in a jungle that allows for no comfort in any guiding light.