The Seafarers International Union (SIU) is a labor organization representing maritime workers in the United States. Founded in 1938, it advocates for the rights and welfare of its members, who work on various vessels, including cargo ships, tankers, and passenger ships. The union provides support in areas such as wages, working conditions, and job security. SIU is affiliated with the AFL-CIO, a national federation of labor unions. The union also offers training programs through its affiliated Paul Hall Center for Maritime Training and Education, helping members enhance their skills and advance their careers in the maritime industry.