Which law requires employers to notify employees of plant closings or mass layoffs?

The Worker Adjustment and Retraining Notification (WARN) Act is the correct answer because it mandates that employers provide advance notice to employees in the event of plant closings or mass layoffs. Specifically, the WARN Act requires employers with 100 or more employees to give at least 60 days' notice before a covered plant closing or mass layoff, allowing workers time to prepare for the transition and seek new employment.

This law aims to protect employees by ensuring they have sufficient time to adjust, access unemployment benefits, and find new job opportunities, thereby mitigating the economic impact of sudden job losses. It also encourages companies to consider the implications of workforce reductions and promote communication with employees about potential changes.

Other laws mentioned, such as the Wagner Act, Taft-Hartley Act, and Norris-La Guardia Act, focus on different aspects of labor relations, including union rights, collective bargaining, and the regulation of labor disputes, but do not directly address the notification requirements related to plant closings or layoffs.