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 his younger brother Robert F. Kennedy as Attorney General. Robert Kennedy had been frustrated in earlier attempts to convict Hoffa, while working as counsel to the McClellan subcommittee. As Attorney General from 1961, Kennedy pursued the strongest attack on organized crime that the country had ever seen, and he carried on with a so-called "Get Hoffa" squad of prosecutors and investigators. In 1964, Hoffa was convicted in Chattanooga, Tennessee of attempted bribery of a grand juror, and was sentenced to eight years. This case resulted from an earlier matter, the Test Fleet case, the trial for which had been held