Organized labor also expanded the ranks of the middle class. For the first time ever, trade unions and collective bargaining became major factors in the nation's economic life. The power balance shifted during the Great Depression, and by the time the dust settled after WWII, labor unions overwhelmingly represented America's industrial workforce. By the beginning of the 1950s, the nation's major industries, including auto, steel, clothing, chemicals, and virtually all consumer product manufacturing, were operating with union contracts.