Final answer:
The ACLU identifies organized movements of labor and of the farmers as waging the 'chief fight' for civil liberties in the United States because these groups have historically fought for the rights and freedoms of workers and farmers.
Step-by-step explanation:
The American Civil Liberties Union (ACLU) identifies organized movements of labor and of the farmers as waging the 'chief fight' for civil liberties in the United States because these groups have historically fought for the rights and freedoms of workers and farmers.
Organized labor movements, such as the National Labor Union and the American Federation of Labor, advocated for workers' rights, including fair wages, safe working conditions, and the right to collective bargaining.
Farmers' movements, such as the National Farm Workers Association and the United Farm Workers, fought for the rights of migrant farm workers and sought better working conditions and fair treatment in the agricultural industry.