From http://www.ghost-story.co.uk/stories/alcatraz3.html

"After more than three years on the Rock, Capone was on the edge of total insanity. He spent the last year of his sentence in the hospital ward, undergoing treatment for an advanced case of syphilis. Most of the time he spent in the ward, he spent playing his banjo. His last day on Alcatraz was January 6, 1939. He was then transferred to the new Federal prison at Terminal Island near Los Angeles. When he was paroled, he became a recluse at his Palm Island, Florida estate. He died, broken and insane, in 1947."

Let that be a warning to you.