The early 1960s were hard years for Cuban president Fidel Castro. His revolution had succeeded only a year earlier and already the CIA began what would turn out to a documented 638 attempts on his life. In 1961, he fought off the ill-fated Bay of Pigs invasion, another U.S.-led attempt to bring about regime change in Cuba. JFK, as president, authorized all this. Few would have had a stronger motive to kill JFK than Castro, as revenge for the assassination attempts and to eliminate the man who was trying to bring him down.