A bounty hunter was an individual who caught fugitives for money.
Space Major Jon Bowman, the commander of the Wayfarer, was a bounty hunter paid by Earth Command to hunt Daleks. (PROSE: Prisoner of the Daleks)
The Krulius was a bounty hunter who stole aliens from across the galaxy. (WC: Monster Hunt)
Mr Plurk and Mr Scozz were bounty hunters. They were hired by Bernice Summerfield's publisher to ensure that she finished The Dead Men Diaries on time. Impressed with the book, they tried teaching Bounty Hunter Studies at the Braxiatel Collection. Mr Scozz was killed in a gunfight during his first tutorial session. Mr Plurk, however, went on to become a professor and the chair of Bounty Hunter Studies at the Collection. (PROSE: The Dead Men Diaries)