Which of the following phrases best captures the philosophy behind the AFL's tactics?

The phrase "strength in numbers" best encapsulates the philosophy behind the American Federation of Labor (AFL) tactics. This organization was primarily focused on uniting skilled workers to leverage their collective power in negotiations with employers. By fostering solidarity among workers, the AFL aimed to enhance their bargaining position, push for better pay, safer working conditions, and more favorable labor policies.

The essence of the AFL's approach was rooted in the belief that when workers band together, they can effectively advocate for their rights and interests, thus amplifying their individual voices through the power of collective action and union representation. This unified front was pivotal in achieving significant labor gains during the late 19th and early 20th centuries.

Contextually, "individual achievement" does not align with the AFL's collective ethos, as the organization prioritized group solidarity over individual endeavors. "Corporate sponsorship" is not relevant since the AFL was more focused on challenging corporate practices than seeking support from business entities. Lastly, while "government intervention" sometimes played a role in labor relations, the AFL’s primary tactics revolved around self-organization and collective bargaining rather than seeking direct government involvement.