Lyndon Baines Johnson (August 27, 1908 – January 22, 1973), often referred to as LBJ, was the 36th President of the United States (1963–1969), a position he assumed after his service as the 37th Vice President of the United States (1961–1963). He is one of only four people who served in all four elected federal offices of the United States: Representative, Senator, Vice President, and President. Johnson, a Texas Democrat, served as a United States Representative from 1937–1949 and as a Senator from 1949–1961, including six years as United States Senate Majority Leader, two as Senate Minority Leader and two as Senate Majority Whip. After campaigning unsuccessfully for the Democratic nomination in 1960, Johnson was asked by John F. Kennedy to be his running mate for the 1960 presidential election.

Johnson succeeded to the presidency following the assassination of John F. Kennedy on November 22, 1963, completed the rest of Kennedy's term and was elected President in his own right, winning by a large margin in the 1964 election. Johnson was greatly supported by the Democratic Party and as President, he was responsible for designing the "Great Society" legislation that included laws that upheld civil rights, public broadcasting, Medicare, Medicaid, environmental protection, aid to education, and his "War on Poverty." He was renowned for his domineering personality and the "Johnson treatment," his coercion of powerful politicians in order to advance legislation.

Jim Marrs (born 5 December 1943) is an American former newspaper journalist and New York Times best-selling author of books and articles on a wide range of alleged cover ups and conspiracies. Marrs is a prominent figure in the JFK conspiracy press and his book Crossfire was a source for Oliver Stone's film JFK. He has written books asserting the existence of government conspiracies regarding aliens, 9/11, telepathy, and secret societies. He was once a news reporter in the Dallas–Fort Worth Metroplex and has taught a class on the Kennedy Assassination at University of Texas at Arlington for 30 years. Marrs is a member of the Scholars for 9/11 Truth.

A native of Fort Worth, Texas, Marrs earned a Bachelor of Arts degree in journalism from the University of North Texas in 1966 and attended graduate school at Texas Tech in Lubbock for two years more. He has worked for several Texas newspapers, including the Fort Worth Star-Telegram, where, beginning in 1968, he served as police reporter and general assignments reporter covering stories locally, in Europe, and in the Middle East. After a leave of absence to serve with a Fourth Army intelligence unit during the Vietnam War, he became military and aerospace writer for the newspaper and an investigative reporter.

John Edgar Hoover (January 1, 1895 – May 2, 1972) was the first Director of the Federal Bureau of Investigation (FBI) of the United States. Appointed director of the Bureau of Investigation—predecessor to the FBI—in 1924, he was instrumental in founding the FBI in 1935, where he remained director until his death in 1972 aged 77. Hoover is credited with building the FBI into a large and efficient crime-fighting agency, and with instituting a number of modernizations to police technology, such as a centralized fingerprint file and forensic laboratories.

Late in life and after his death Hoover became a controversial figure as evidence of his secretive actions became public. His critics have accused him of exceeding the jurisdiction of the FBI. He used the FBI to harass political dissenters and activists, to amass secret files on political leaders, and to collect evidence using illegal methods. FBI directors are now limited to one 10-year term, subject to extension by the United States Senate, because of his long and controversial tenure.

Walter Leland Cronkite, Jr. (November 4, 1916 – July 17, 2009) was an American broadcast journalist, best known as anchorman for the CBS Evening News for 19 years (1962–81). During the heyday of CBS News in the 1960s and 1970s, he was often cited as "the most trusted man in America" after being so named in an opinion poll. Although he reported many events from 1937 to 1981, including bombing in World War II, the Nuremberg trials, combat in the Vietnam War,Watergate, the Iran Hostage Crisis, and the murders of President John F. Kennedy, civil rights pioneer Martin Luther King, Jr., and The Beatles musician John Lennon, he was known for extensive TV coverage of the U.S. space program, from Project Mercury to the Moon landings to the Space Shuttle. He was the only non-NASA recipient of a Moon-rock award. Cronkite is well known for his departing catchphrase "And that's the way it is," followed by the date on which the appearance is aired.

Cronkite was born in Saint Joseph, Missouri, the son of Helen Lena (née Fritsche, August 1892 - November 1993), and Dr. Walter Leland Cronkite (September 1893 - May 1973), a dentist. He had remote Dutch ancestry on his father's side, the family surname originally being Krankheyt.