Carlo Gambino died in his own bed in the country of his choosing.
Not exactly. Carlo Gambino was probably what we call an illegal alien today. If he had left the United States, it would be difficult for him to return. So he was very much a prisoner in the United States.
He could leave of course, and he might have done so and returned more than once, but he took a risk each time. Not being able to return meant that he would forfeit the kingdom he was sitting atop of.
