During the period before the war, all companies with the exception of Alkett (which was under the control of Rhine-Metal Borsig, a subsidiary of the government-controlled Hermann Göring Works) were privately owned stock companies with the stock available for purchase by the public. All these companies, with the exception again of Alkett, produced tanks in addition to their normal peacetime manufacture of trucks, locomotives, and other heavy equipment. From 1935 onward, the government progressively increased its control over industries engaged in rearmament. The Nazi Party's Four Year Plan introduced in 1936 placed Hermann Göring in leadership of the state's efforts to bring industry into state control. Through threat and coercion Göring was able to expand the Nazi Party's control of private industry involved in steel and armament production. By 1938, this control included the rationing of essential raw materials, factory inventories, labor hours, rates of pay, working conditions, building and machine tool expansion, plant locations and stock dividends. All companies were forced to join the Economic Board of the tank industry which handled all questions affecting the industry.