Blacie Glaxton was a gangster to whom Bennet Brant owed a large gambling debt. He blackmailed Brant into getting his sister Betty to contact Doctor Octopus when he was released from prison in order to spring Glaxton from prison himself. When Spider-Man caught up with Glaxton and Octopus on his getaway ship, Glaxton accidentally shot Bennet during a struggle with Spider-Man. He was arrested again and supposedly returned to prison[1].
Hired Doctor Octopus to break him out of prison. Blackie Gaxton gets carted off to jail and is never seen again. (Though he's mentioned in Untold Tales of Spider-Man.)