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
James P. Hoffa pension, health and welfare benefits. "We…have negotiated an agreement that will greatly benefit our members at U.P.S. as well as Teamster members in other industries covered by pension and health and welfare funds." Teamster freight members ratified a new, National Master Freight Agreement (NMFA) in February, 2008. Covering 60,000 workers at YRC Worldwide, Yellow Transportation, Roadway and regional units at USF Holland and New Penn Motor Express. On February 20, 2008, Hoffa became the first major union leader to endorse Senator Barack Obama (D-IL) in his bid for President of the United States. Hoffa campaigned in major states for Obama