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Workers who have organized into unions have much more power to make changes than workers acting on their own. This power can be used through collective bargaining to negotiate improved wages and working conditions. The option of calling a legal strike, should negotiations fail, makes it much more likely that worker demands will be met.
D: Communism. A major example would be the USSR and their "overnight industrialization" that took place in the 1920's-1930's
14th amendment . Which granted citizenship to all persons born or naturalized in the United States—including former slaves—and guaranteed all citizens “equal protection of the laws.”
There were few government regulations so businesses used ruthless tactics to eliminate their competition.