Jimmy Hoffa Agreement. He played a major role in the growth and development of the union, which eventually became the largest (by membership) in the United States with over 2.3 million members at its peak, during his terms as its leader. Hoffa became involved with organized crime from the early years of his Teamsters work, and this connection continued until his disappearance in 1975. He was convicted of jury tampering, attempted bribery and fraud in 1964, in two separate trials. He was imprisoned in 1967 and sentenced to 13 years. In mid-1971, he resigned as president of the union as part of
Jimmy Hoffa a case for his union leadership skills being of more value to the nation, by keeping freight running smoothly to assist the war effort. At the 1952 IBT convention in Los Angeles, Hoffa was selected as national vice-president by incoming president Dave Beck, successor to Daniel J. Tobin, who had been president since 1907. Hoffa had quelled an internal revolt against Tobin by securing Central States regional support for Beck at the convention. In exchange, Beck made Hoffa a vice-president. The IBT moved its headquarters from Indianapolis to Washington, D.C., taking over a large office building in the capital in