Which author was a prominent voice in the naturalism movement, focusing on moral purposes in literature?

Frank Norris was a significant figure in the naturalism movement, which emerged in the late 19th and early 20th centuries. Naturalism in literature often explored the darker aspects of human existence, emphasizing the impact of environment, heredity, and social conditions on individuals’ lives. Norris's works, such as "McTeague" and "The Octopus," epitomize these themes by illustrating the struggles of individuals against overwhelming forces, such as nature, society, and fate. His writing did not just focus on depicting life as it is, but he infused a moral dimension that sought to expose societal injustices and provoke thought about the human condition and the struggles faced by the working class. This aligns with the tenets of naturalism, where authors aimed to highlight the complexities of life while also urging readers to reflect on broader moral implications and societal issues.