What was Frank Norris known as during the Progressive Era to expose corruption in business?

Frank Norris was known as a leading muckraker during the Progressive Era, using his literary works to expose corruption and unethical practices in business and society. His novels, such as "McTeague" and "The Octopus," highlighted the struggles of individuals against powerful corporate interests, particularly in the agriculture and railroad industries. Through his vivid storytelling, Norris aimed to inspire social reform and shed light on the darker aspects of capitalism.