Much of Tobin's presidency was consumed by a long-running and sometimes physically violent jurisdictional battle with the National Union of United Brewery Workmen. The Teamsters had challenged the Brewery Workmen's right to organize beer wagon drivers in 1903 and 1905. At Tobin's insistence, in 1907 the AFL revoked the Brewery Workers' charter, but a firestorm of protest from local unions around the country led the AFL to reinstate the charter in 1909. In 1933, the AFL Executive Council agreed to strip the brewery workers' union, now known as the United Brewery Workers, of the beer drivers. The United Brewery Workers filed suit in federal court in 1936 seeking to bar their suspension and the transfer of workers to the Teamsters. As the case worked its way to the Supreme Court of the United States the AFL attempted to mediate the dispute to no avail. The Supreme Court found in the AFL's favor, and the United Brewery Workers were suspended from the AFL.