John F. Kennedy assassination conspiracy theories of the plot was thwarted, the authors allege, because it would have revealed embarrassing evidence of American government involvement with organized crime in plots to kill Castro. A 2003 Gallup poll indicated that nearly 20% of Americans suspected Lyndon B. Johnson of being involved in the assassination of Kennedy. Critics of the Warren Commission have accused Johnson of plotting the assassination because he "disliked" the Kennedys and feared that he would be dropped from the Democratic ticket for the 1964 election. According to journalist Max Holland, the first published allegation that Johnson perpetrated the assassination of Kennedy appeared in Penn
John F. Kennedy assassination conspiracy theories indicated there was complicity on the part of Johnson include Jim Marrs, Ralph D. Thomas, J. Gary Shaw, Larry Harris, Walt Brown, Noel Twyman, Barr McClellan, Craig Zirbel, Phillip F. Nelson, and Madeleine Brown. The fact that JFK was seriously considering dropping Johnson from the ticket in favor of NC Governor Terry Sanford should Kennedy run in 1964 has been cited as a possible motive for Johnson's complicity in the assassination. In 1968, Kennedy's personal secretary Evelyn Lincoln wrote in her book, ""Kennedy and Johnson"" that President Kennedy had told her that Lyndon B. Johnson would be replaced as Vice