Jim Craddock (Earth-2: Post-Crisis)

"Well, I think you've turned over enough rocks for tonight, so time to hit the sack. But what about Gentleman Ghost? Go to bed."

- Pat Dugan and Courtney Whitmore

James Craddock was the criminal known as Gentleman Ghost and a member of the Injustice Society of America.

Injustice Society of America
At some point, James Craddock became the criminal known as Gentleman Ghost. He eventually became a member of the Injustice Society of America and an enemy of the Justice Society of America.

Powers

 * Ghost Physiology: Craddock presumably had superhuman powers due to his ghostly physiology.