David Slawson, a lawyer on the Warren Commission who searched for evidence of a foreign conspiracy in the assassination, now believes there was a “massive cover-up” by government officials who wanted to hide the fact that — if they'd acted on evidence they had in November 1963 — the assassination might have been prevented.
So says former New York Times reporter Philip Shenon, in the afterword to the new paperback edition of his book "A Cruel and Shocking Act: The Secret History of the Kennedy Assassination."
Slawson says that while he's certain Lee Harvey Oswald was the only gunman, he suspects that the CIA withheld from the commission its knowledge of meetings Oswald had in Mexico with Cuban diplomats and Mexican civilians who urged Oswald to kill Kennedy.
Slawson theorizes that Attorney General Robert Kennedy and the CIA worked together to hide information about Oswald’s Mexico trip from the commission because they feared that the investigation might stumble onto the fact that JFK’s administration had been trying for years, sometimes with the help of the Mafia, to assassinate Castro.
Mexico had been a staging area for the plots against Castro, says Shenon.
And public disclosure of the plots, says Slawson, could have derailed, if not destroyed, Robert Kennedy’s political career; he had led his brother’s secret war against Castro.