This chapter examines Article IX of the Oklahoma constitution, which concerns the powers, limits, and regulation of corporations. The prodigious length of the article reflects the importance of corporations in the economic life of Oklahoma, and the determination of the framers to bring them under regulatory control, to the point of micromanagement. Concern about discriminatory rates charged by railroads and pipelines was foremost, but the authority conferred by Article IX is broad enough to allow the legislature to regulate a variety of other enterprises as well, including electric, gas, and water companies; oil and natural gas production; and conservation, cotton gins, motor carriers, telephone and telegraph lines; and even ice plants. The framers borrowed freely from the constitutions and statutes of other states—especially the Virginia constitution, the Texas constitution, and the Texas Railway Act—as models for Article IX. Whole sections were often copied verbatim. Moreover, often competing strains of waning Populism and rising Progressivism of the early 1900s pervade this article.