Al Capone was a powerful and influential gangster in Chicago during the Prohibition Era. He hired Tom Dekker to investigate a speakeasy called "Doc's Place". It was run by the Seventh Doctor, who was trying to stop Agonal's evil manipulation of Capone and others. (PROSE: Blood Harvest)

He was imprisoned in Alcatraz. (PROSE: Players)

The Eleventh Doctor was uncertain if it had been Al Capone or Genghis Khan who had told him that villains wanted records of exactly how bad they'd been. (PROSE: Borrowed Time)