The National Association of Letter Carriers (NALC) is a labor union in the United States that represents city letter carriers employed by the United States Postal Service (USPS). Founded in 1889, the NALC advocates for the rights and benefits of its members, including fair wages, job security, and improved working conditions. The NALC also engages in political activities to influence legislation that affects postal workers and the postal service. The union promotes community service and supports various charitable initiatives, emphasizing the importance of letter carriers in connecting people and businesses across the nation.