U.S. Senate
In
1942, after
G. Lloyd Spencer decided not to seek re-election, McClellan ran for the Senate again and this time won. He served as U.S. Senator from Arkansas from 1943 to 1977, when he died in office. During his tenure, he served as chairman of the Appropriations Committee and served 22 years as chairman of the Committee on Government Operations. McClellan was the longest serving United States Senator in Arkansas history. During the later part of his Senate service, Arkansas had, perhaps, the most powerful congressional delegation with McClellan as chairman of the Senate Appropriations Committee,
J. William Fulbright as chairman of the Senate Foreign Relations Committee,
Wilbur Mills as chairman of the House Ways and Means Committee,
Oren Harris as chairman of the House Commerce Committee,
Ezekiel C. "Took" Gathings as chairman of the House Agriculture Committee, and
James William Trimble as a member of the powerful House Rules Committee. McClellan also served for eighteen years as chairman of the
Senate Permanent Subcommittee on Investigations (1955–1973) and continued the hearings into
subversive activities at the
U.S. Army Signal Corps,
Fort Monmouth, New Jersey, where
Soviet spies
Julius Rosenberg,
Al Sarant and
Joel Barr all worked in the 1940s. He was a participant in the famous
Army-McCarthy Hearings and led a Democratic walkout of that subcommittee in protest of Senator
Joseph McCarthy's conduct in those hearings. McClellan appeared in the 2005 movie
Good Night, and Good Luck in footage from the actual hearings. He led two other investigations, both televised, uncovering law-breaking and corruption. The first of these, under the
United States Senate Select Committee on Improper Activities in Labor and Management, also known as the McClellan Committee, investigated union corruption and centered on
Jimmy Hoffa and lasted from January 1957 to March 1960. In April 1961, during an Investigations subcommittee hearing, contractor Henry Gable asserted that Communists would not be able to do the same amount of damage to the American missile effort as done by labor at
Cape Canaveral. McClellan suggested that the comments bordered on accusations of subversion and called for more testimony from the unions. The second televised major investigation led by McClellan was in 1964 and known as the
Valachi hearings. These hearings investigated the operations of organized crime and featured the testimony of
Joseph Valachi, the first American mafia figure to testify about its criminal activities. McClellan continued his efforts against organized crime (including backing the anti-organized-crime
(RICO) law) until 1973, when he switched to investigating political subversion. During this period, he hired
Robert F. Kennedy as chief counsel and vaulted him into the national spotlight. McClellan investigated numerous cases of government corruption including numerous defense contractors and
Texas financier
Billie Sol Estes. In 1957, McClellan opposed
U.S. President Dwight D. Eisenhower's decision to send federal troops to enforce the desegregation of
Central High School in Little Rock. Prior to the sending of the troops under the command of Major General
Edwin A. Walker, McClellan had expressed "regret [regarding] the ... use of force by the federal government to enforce integration. I believe it to be without authority of law. I am very apprehensive that such action may precipitate more trouble than it will prevent." McClellan and fellow Senator
Robert S. Kerr of Oklahoma were the sponsors of the bill that authorized construction of the
McClellan-Kerr Arkansas River Navigation System, maintained by the
Army Corps of Engineers. The system transformed the often shallow and sometimes dry
Arkansas River into a major transportation route and water source. Although his Select Committee on Improper Activities in Labor and Management already had been dissolved by 1960, McClellan began a related three-year investigation in 1963, through the Permanent Subcommittee on Investigations, into the union benefit plans of labor leader
George Barasch, alleging misuse and diversion of $4,000,000 of benefit funds. McClellan's notable failure to find any legal wrongdoing led to his introduction of several pieces of new legislation including his own bill on October 12, 1965 setting new fiduciary standards for plan trustees. Senator
Jacob K. Javits (R-NY) introduced bills in 1965 and 1967 increasing regulation on welfare and pension funds to limit the control of plan trustees and administrators. Provisions from all three bills ultimately evolved into the guidelines enacted in the
Employee Retirement Income Security Act of 1974 (ERISA). In 1977, McClellan was one of five Democrats to vote against the nomination of
F. Ray Marshall as
United States Secretary of Labor. ==Personal life==