Daniel Hickey aka Agent Polk (born in 1890) was an American grifter known for took part in Doyle Lonnegan's con in 1936. He acted as an FBI Agent named Polk to trick William Snyder and helped Johnny Hooker to get rid of him. He shot Henry Gondorff for shooting Hooker during his raid the parlor. Then he ordered Snyder to get the ostensibly respectable Lonnegan away from the crime scene. With Lonnegan and Snyder safely away, Hooker and Gondorff rise amid cheers and laughter. And Agent Polk revealing himsefl as Hickey.