Huey Pierce Long Jr. (August 30, 1893 September 10, 1935), nicknamed "the Kingfish," was an American politician who served as the 40th governor of Louisiana from 1928 to 1932 and as a United States senator from 1932 until his assassination in 1935. He was a left-wing populist member of the Democratic Party and rose to national prominence during the Great Depression for his vocal criticism of President Franklin D. Roosevelt and his New Deal, which Long deemed insufficiently radical. As the political leader of Louisiana, he commanded wide networks of supporters and often took forceful action. A controversial figure, Long is celebrated as a populist champion of the poor or, conversely, denounced as a fascistic demagogue.

Long was born in the impoverished north of Louisiana in 1893. After working as a traveling salesman and briefly attending three colleges, he was admitted to the bar in Louisiana. Following a short career as an attorney, in which he frequently represented poor plaintiffs, Long was elected to the Louisiana Public Service Commission. As Commissioner, he prosecuted large corporations such as Standard Oil, a lifelong target of his rhetorical attacks. After Long successfully argued before the U.S. Supreme Court, Chief Justice and former president William Howard Taft praised him as "the most brilliant lawyer who ever practiced before the United States Supreme Court".

After a failed 1924 campaign, Long used the sharp economic and class divisions in Louisiana to win the 1928 gubernatorial election. Once in office, he expanded social programs, organized massive public works projects, such as a modern highway system and the tallest capitol building in the nation, and proposed a cotton holiday. Through political maneuvering, Long became the political boss of Louisiana. He was impeached in 1929 for abuses of power, but the proceedings collapsed in the State Senate. His opponents argued his policies and methods were unconstitutional and dictatorial. At its climax, political opposition organized a minor insurrection.

Long was elected to the U.S. Senate in 1930 but did not assume his seat until 1932. He established himself as an isolationist, arguing that Standard Oil and Wall Street orchestrated American foreign policy. He was instrumental in securing Roosevelt's 1932 nomination but split with him in 1933, becoming a prominent critic of his New Deal. As an alternative, he proposed the Share Our Wealth program in 1934. To stimulate the economy, he advocated massive federal spending, a wealth tax, and wealth redistribution. These proposals drew wide support with millions joining local Share Our Wealth clubs. Poised for a 1936 presidential bid, Long was mortally wounded by a lone assassin in 1935. Although Long's movement faded, Roosevelt adopted many of his proposals in the Second New Deal, and Louisiana elections would be organized along anti- or pro-Long factions until the 1960s. He left behind a political dynasty that included his wife, Senator Rose McConnell Long; his son Senator Russell B. Long; and his brother, Governor Earl Long, among others.

The United States Senate is the upper chamber of the United States Congress, with the House of Representatives being the lower chamber. Together they compose the national bicameral legislature of the United States.

The composition and powers of the Senate are established by Article One of the United States Constitution. The Senate is composed of senators, each of whom represents a single state in its entirety. Each state is equally represented by two senators who serve staggered terms of six years. There are currently 100 senators representing the 50 states. The vice president of the United States serves as presiding officer and president of the Senate by virtue of that office, and has a vote only if the senators are equally divided. In the vice president's absence, the president pro tempore, who is traditionally the senior member of the party holding a majority of seats, presides over the Senate.

As the upper chamber of Congress, the Senate has several powers of advice and consent which are unique to it. These include the approval of treaties, and the confirmation of Cabinet secretaries, federal judges (including Federal Supreme Court justices), flag officers, regulatory officials, ambassadors, other federal executive officials and federal uniformed officers. If no candidate receives a majority of electors for vice president, the duty falls to the Senate to elect one of the top two recipients of electors for that office. The Senate conducts trials of those impeached by the House.

The Senate is widely considered both a more deliberative and more prestigious body than the House of Representatives due to its longer terms, smaller size, and statewide constituencies, which historically led to a more collegial and less partisan atmosphere.From 1789 to 1913, senators were appointed by legislatures of the states they represented. They are now elected by popular vote following the ratification of the Seventeenth Amendment in 1913. In the early 1920s, the practice of majority and minority parties electing their floor leaders began. The Senate's legislative and executive business is managed and scheduled by the Senate majority leader.

The Senate chamber is located in the north wing of the Capitol Building in Washington, D.C.