In the late 19th century and early 20th century, businesses used pools and holding companies to increase their profits and eliminate their competition. This was done through the creation of a monopoly (a business controlling the majority of all the market for a good or service). Since "industralist" is a tern thats defined as a person involved in the ownership and management of industry, then it can be inferred that they were the people who benefited of the use of pools and holding companies.