In 2005, the NUP dissolved and the Change to Win Federation (CtW) formed, threatening to secede from the AFL–CIO if its demands for major reorganization were not met. As the AFL–CIO prepared for its 50th anniversary convention in late July, three of the federations' four largest unions announced their withdrawal from the federation: the Service Employees International Union (SEIU), the International Brotherhood of Teamsters ("The Teamsters"), and the United Food and Commercial Workers International Union (UFCW). UNITE HERE disaffiliated in mid-September 2005, the United Farm Workers left in January 2006, and the Laborers' International Union of North America disaffiliated on June 1, 2006.