A grave robber was an individual who broke into graves to steal valuables.
The ancient Promellians used automated drones to protect their necropolis complexes from grave robbers. (DIS: "Under the Twin Moons")
In 2381, Beckett Mariner wrested a Klingon golden idol from Ferengi grave robbers. (LD: "The Stars At Night")
In the 3180s, grave robbers attacked a moon housing the last survivors of the Abronian civilization in cryostasis, seeking to harvest the latinum within the Abronians' bodies. They were killed by J'Vini, a sister of the Qowat Milat. (DIS: "Choose to Live")