Jimmy Hoffa a result of Hoffa's work with other union leaders to consolidate local union trucker groups into regional sections, and then into a national body — work that Hoffa ultimately completed over a period of two decades — membership grew to 170,000 members by 1936. Three years later, there were 420,000. The number grew steadily during World War II and through the post-war boom to top a million members by 1951. The Teamsters organized truck drivers and warehousemen, first throughout the Midwest, then nationwide. Hoffa played a major role in the union's skillful use of "quickie strikes", secondary boycotts, and other
Jimmy Hoffa see." At the time, IBT was bringing in over $750,000 annually to the AFL-CIO. Following his re-election as president in 1961, Hoffa worked to expand the union. In 1964, he succeeded in bringing virtually all over-the-road truck drivers in North America under a single National Master Freight Agreement, in what may have been his biggest achievement in a lifetime of union activity. Hoffa then tried to bring the airline workers and other transport employees into the union, with limited success. During this period, he was facing immense personal strain as he was under investigation, on trial, launching appeals of convictions,