Al Capone himself was the leader of a criminal organization known as the Chicago Outfit or the Capone mob. The Chicago Outfit was a powerful criminal syndicate that engaged in various illegal activities such as bootlegging, gambling, prostitution, and racketeering. Capone's gang operated primarily in Chicago, Illinois, and had a significant influence on organized crime in the city and beyond.
It's possible that the term "Mr. Capone-E Gang" is a colloquial or fictionalized name that has been used in popular culture, literature, or fictional accounts of Capone's era. However, it is not a recognized or factual name for any historical criminal gang led by Al Capone.