One of Enron's primary predecessors was InterNorth, which was formed in 1930, in Omaha, Nebraska, just a few months after Black Tuesday. The low cost of natural gas and the cheap supply of labor during the Great Depression helped to fuel the company's early beginnings, doubling in size by 1932. Over the next 50 years, Northern expanded even more as it acquired many energy companies. It was reorganized in 1979 as the main subsidiary of a holding company, InterNorth, a diversified energy and energy-related products firm. Although most of the acquisitions conducted were successful, some ended poorly. InterNorth competed with Cooper Industries unsuccessfully over a hostile takeover of Crouse-Hinds Company, an electrical products manufacturer. Cooper and InterNorth feuded in numerous suits during the course of the takeover that were eventually settled after the transaction was completed. The subsidiary Northern Natural Gas operated the largest pipeline company in North America. By the 1980s, InterNorth became a major force for natural gas production, transmission, and marketing as well as for natural gas liquids, and was an innovator in the plastics industry. In 1983, InterNorth merged with the Belco Petroleum Company, a Fortune 500 oil exploration and development company founded by Arthur Belfer.