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 or imprisoned for virtually all of the 1960s. Hoffa was re-elected, without opposition, to a third five-year term as president of the IBT, despite having been convicted of jury tampering and mail fraud in court verdicts that were stayed pending review on appeal. Delegates in Miami Beach also elected Frank Fitzsimmons as first vice-president, to become president "if Hoffa has to serve a jail term". Hoffa had first faced major criminal investigations in 1957, as a result of the McClellan Senate hearings. He avoided conviction for several years. However, when John F. Kennedy was elected president in 1960, he appointed