A trade union in the USA. Formed in 1903, its members are workers in the transport industry. In the late 1950s its president, David Beck, was indicted for having links with criminals, and his successor, James R. Hoffa, was found guilty of attempting to influence a federal jury while on trial in 1964 for misusing union funds. The revelations of corruption did immense damage to the reputation of unions, and the Teamsters union was expelled from the AFL–CIO (see AFL) in 1957. It was readmitted in 1987, but left in 2005 to join the Change to Win alliance. From the 1980s its membership among transport workers declined but it diversified into other areas.