The term PIER GP refers to two organizations, the International Longshore and Warehouse Union (ILWU) and the International Longshoremen's Association (ILA). The ILWU is a labor union representing dockworkers, warehouse workers, and other workers in the shipping industry. The ILA is a labor union representing longshoremen, stevedores, and other workers in the maritime industry. Both organizations are involved in collective bargaining and labor disputes.