However, he is in NO way, shape, or form the most powerful who ever live. Most people believe he is the most powerful just because he is the most famous. Actually, there were many more gangsters who were more powerful than he was.
Also, he was not the most influential. Most sources believe Lucky Luciano is the most influential gangster who ever lived.
There are so many misconceptions running around Al Capone mainly, once again, because he is simply the most famous. If one were to take into account every gangster who ever lived and rank them according to power and influence, then Capone would rank very high, but he would be nowhere near the top. One's best bet on getting proper information about Al Capone is to read it from Wikipedia or CrimeLibrary.