One of the largest and most powerful labor unions in the U.S.

The International Brotherhood of Teamsters (IBT), formerly known by the name International Brotherhood of Teamsters, Chauffeurs, Warehousemen and Helpers of America, is one of the largest labor unions in the United States. The union's name and logo reflect its origins as a craft union when founded in 1903: a teamster was originally a person who drove a team of oxen, a horse-drawn or mule-drawn wagon or a muletrain (in the latter case, he was also known as a muleteer).