A longshoremen's union is an organization that represents workers who load and unload cargo from ships at ports. These unions advocate for the rights and interests of their members, ensuring fair wages, safe working conditions, and job security. They negotiate contracts with employers and provide support during disputes. Longshoremen's unions are part of the larger labor movement, which seeks to improve working conditions across various industries. They often collaborate with other unions and organizations to address issues affecting workers, such as labor laws and safety regulations. Notable unions include the International Longshore and Warehouse Union (ILWU) and the International Longshoremen's Association (ILA).