What significant movement aimed to improve conditions for laborers in the early 20th century?

The Labor Movement was a significant effort during the early 20th century focused on improving working conditions for laborers. This movement sought better wages, reasonable working hours, and safer workplace environments. Industrialization had led to harsh conditions for many workers, including long hours, low pay, and dangerous conditions, which highlighted the need for reform.

Labor unions played a crucial role in the movement by organizing workers to collectively bargain with employers. Strikes and labor actions were common tactics used to draw attention to the plight of workers and to push for labor rights. Notable events, like the Pullman Strike and the founding of organizations such as the American Federation of Labor, illustrated the movement’s commitment to advocating for workers' rights.

While the other movements mentioned also sought social improvements—such as civil rights for African Americans, suffrage for women, and broader social reform—the Labor Movement specifically concentrated on the workforce and labor conditions, making it the most relevant choice to the question about improving conditions for laborers during that time.