Which federal law protects workers from unfair wages, limits abusive overtime practices, and prevents child labor?

The National Labor Relations Act (NLRA) primarily addresses the rights of employees to organize and engage in collective bargaining. While it supports workers' rights to unionize, it does not specifically regulate wage standards or overtime practices, thus failing to protect workers from unfair wages.

The Public Employment Relations Act (PERA) governs labor relations between public sector employees and their employers. It focuses on collective bargaining rights for public employees but does not establish federal wage or overtime standards, making it irrelevant to the question of wage protection and child labor prevention.

The Family Medical Leave Act (FMLA) allows eligible employees to take unpaid, job-protected leave for specific family and medical reasons. While it provides important job security, it does not pertain to wage practices or child labor, thus not fulfilling the question's requirements.