Very good article. "Bobby Kennedy's Justice Dept. kidnapped Marcello" is only a slight exaggeration:

Like many Sicilian Mafiosi, Marcello entered the US illegally from Tunis, which had a big Sicilian population in the late 19th and early 20th centuries. He had the money and legal muscle to fight deportation--all he had to do was show up at the INS office in New Orleans with his lawyer to get an extension. But at his first visit in 1961, he was met by Justice Dept. lawyers, who claimed that he had a fake Guatemalan passport. With his lawyer protesting, Marcello was handcuffed, marched to a government airplane, and flown to Guatemala City. The government there, tipped off by the Justice Department, declared him persona non grata, marched him to the border with Honduras, and dumped into a jungle, where he was expected to die. He was able to get to a village and contact his people in Louisiana, who sent a shrimp boat to bring him back to the US. He was promptly arrested and charged with illegal entry. He was tried and acquitted on...November 22, 1963

"Is it true? Is it false...that the Mafia conspired to remove Kennedy from office by violence? These things are lost to history...We will never know for sure."

How very true! Given the passage of 58 years, the death of so many people who were in the know or might have been in the know, and the loss or destruction of so much possible evidence, the only certainty about the Kennedy assassination is that the case will never be closed.