*Marilyn Monroe
John Kennedy's affair with CIA agent Cord Meyer's wife Mary led to experiments with marijuana and LSD, but the most famous of the 32 Presidential paramours tallied by J. Edgar Hoover was actress Marilyn Monroe, who was also the lover of Robert Kennedy. Her August 5, 1962 death, ruled suicide, was linked to these dangerous liaisons, which had been observed by several interested parties. John and Marilyn often met in the home of the President's brother-in-law, Peter Lawford, whose house had been wired during the 1960 campaign by GOP "consultants." Later, Monroe's home was bugged for wireman Bernard Spindell, whose usual employer was Jimmy Hoffa. The Monroe tapes haven't been made public, but according to many accounts they contain intimacies with the Kennedys, pro-Castro arguments, and support for ousting J. Edgar Hoover. Most significantly, they record a visit from Robert on the day of Monroe's death, during which the pair argued heatedly. She felt she had been used and dumped by both Kennedys. Knowledge of this last visit would have been a powerful blackmail tool against Robert even if he had nothing to do with her death.
One person who acquired leverage as a result of the tragedy was Hoover, who immediately confiscated Monroe's phone records on Robert's orders. Hoover was hardly a disinterested party; he considered Monroe a security risk and had watched her for years because of her friendships with "communists." Her voluminous FBI files are mostly classified, but it is said they record sex orgies with John, Robert, L.A. Police Chief William Parker, and other women - and state she was pregnant by Robert and had had an abortion before she died.
*Source: Back of card