Bounty hunter
From Memory Alpha, the free Star Trek reference.
A bounty hunter is a person who hunts criminals or fugitives for a reward, usually money.
In the mid-22nd century, two bounty hunters, Skalaar and Kago-Darr, independently sought to capture Jonathan Archer to turn him over to the Klingons for a reward. (ENT: "Bounty")
After Joret Dal, a Cardassian, provided the Federation with military information about the Cardassians, he had to return to Cardassian space. The plan required the help of Ensign Sito Jaxa, who was disguised as a Bajoran terrorist to let Joret Dal look like a bounty hunter. (TNG: "Lower Decks")
The Hazari of the Delta Quadrant work as bounty hunters, who pride themselves on honoring their agreements. (VOY: "Think Tank")
