These hearings came to be known as the McClellan Committee hearings, named after the Arkansas senator, John L. McClellan, who presided over them. Future presidential candidates Senator Barry Goldwater of Arizona and Senator John F. Kennedy of Massachusetts were members of the committee. The committee’s chief counsel and principal interrogator was the future president’s younger brother and the nation’s future attorney general, Bobby Kennedy. As a result of his aggressive work on the committee, Bobby Kennedy was to become Jimmy Hoffa’s mortal enemy.