Whether or not the Kennedys suspected Momo was behind Miss Monroe’s death is not known, but suddenly FBI agents dogged his footsteps, worse than ever. Bees on a sugar bar. He never felt unwatched, not even in his Oak Park home. He had no private life. Bobby Kennedy’s words haunted him: I want that dago Sam Giancana put away for good.

Daughter Antoinette remembers the bad times. "The FBI’s so-called lockstep surveillance was a 24-hour watch over my father’s every move and, for that matter, the moves of everyone in his family," says she in Mafia Princess. "Before this, the FBI had already installed illegal bugs in motels and hotels and private homes all over the country to listen in on (my father’s) love life in the remote hope of hearing him make some slip about his criminal life."

Momo even attempted to sue the government for invasion of privacy, something almost unheard of, and lost when the higher courts threw out the case.

Throughout the Outfit it became common knowledge: Momo had been pushed way beyond his limit. He was going to strike big-time against the Kennedy family.

Of the many theories involving who killed President Kennedy and why, Chuck Giancana's Double Cross adds a new theory --that it was indeed his brother Momo who perpetrated the national crime.  Claiming to have first-hand knowledge, he recalls the night that Momo confessed his involvement to him in the privacy of the latter's Oak Park basement:   "He lifted his cigar to his lips and a cruel smile curled like an embrace around it.  There was a deadly silence in the room...For the next hour (Momo) shared the darkest and most horrifying of his secrets."

On November 22, 1963, in a scene reminiscent of the Anton Cermak killing 30 years earlier, John F. Kennedy, riding in an open-car motorcade through the streets of Dallas, had his head blown open by a sniper. Very few in Mobdom were surprised. And when the hysteria died down, neither was Bobby Kennedy.

The nation, however, was, stunned. Not since Lincoln’s assassination had one, single move crippled the emotions of America. The audacious move --to kill the President of the United States -- left citizens reeling in their once-sturdy steps. No one felt safe. But, that sensation came only after anyone was able to feel anything at all under the numbness.

Jack Ruby kills Lee Harvey Oswald (AP)

Communist fanatic kills the President. American fanatic kills the commie. Case closed.

Bobby knew it wasn’t anywhere that simple. "He and Jacqueline Kennedy were convinced that the President had been struck down not by communists, as J. Edgar Hoover and many others believed, but by a domestic conspiracy," Seymour Hersh explains in The Dark Side of Camelot. "One immediate suspect was Sam Giancana, who had been overheard by the FBI since early 1961 claiming again and again that he had been double crossed by Jack Kennedy."

Robert Kennedy mortally wounded (AP)

If author Giancana is correct, Momo's power was greater than even the FBI suspected.   An assassination of a United States President would have been his crowning achievement and would have proven how frightfully far and how high a poverty- stricken boy turned gangster could go with the right connections -- and without a conscience. Chuck Giancana goes on to tell us in Double Cross that, in Momo’s describing the assassination plot to him afterward, it had taken months to mastermind, dozens of men were involved, and, as he quotes Momo, "Richard Nixon and Lyndon Johnson knew about the whole damn thing."