Why Was He Significant to the World

Public Enemy Number One 
In 1930, at the peak of his power, Capone headed Chicago's new list of the twenty-eight worst criminals and became the city's "Public Enemy Number One."  He became FBI's most wanted by all the illicit activities in which he was involved, but was only ever convicted of non-violent crimes.
Capone in Alcatraz 
Because word spread that Capone had taken over in the federal prison in Atlanta, he was sent to Alcatraz. There were no other "outfit" members in Alcatraz, and security was so tight that he had no knowledge of the outside world. He was unable to control anyone or anything and could not buy influence or friends. In an attempt to earn time off for good behavior, Capone became the ideal prisoner and refused to participate in prisoner rebellions or strikes.
Capone's Sentence 
When Al Capone finally went to court, the jury found him not guilty on eighteen of the twenty-three counts against him. Judge Wilkerson sentenced him to a total of ten years in federal prison and one year in the county jail. In addition, Capone had to serve an earlier six-month contempt of court sentence for failing to appear in court. The fines were a cumulative $50,000 and Capone had to pay the prosecution costs of $7,692.29.