Orcs

"...a great company of Orcs are drawing swiftly hither...."

- Beren on Orcs Orcs are the dark creatures bred in Angband that serve the dark lords Morgoth and Sauron, the antagonists of Beren and Lúthien.

Beren and Lúthien (Silmarilion)
"...hunting Orc and wolf a-prowl...."

- Beren slaying servants of Sauron to avenge his father..

Sauron's Orcs capture Gorlim and bring him before their dark master to be interrogated. After the fallen Maia learns of King Barahir's whereabouts he has the prisoner cruelly slain and sends Gorgol the Butcher to hunt down the Men.

Beren avenges his father Barahir's death by slaying Gorgol and taking the king's ring back, before fleeing from the pursuing Orcs of Sauron.

When Lúthien and Beren enter Angband, she puts the servants of Morgoth under her spell, causing the Orcs and Balrogs to fall asleep.

Beren and Lúthien (2017)
"Now goes he....hunting Orcs and thanes of Tevildo..."

- On Huan hunting dark servants of evil Goblins are mentioned as being dangers of the wild, implying that they might be allied with Melko but not necessarily in his service. Since Orcs are also mentioned together with goblins, they may also be independent of the dark lord of Angband.

When Lúthien and Beren enter Angband, she puts the servants of Melko under her spell, causing the Orcs to fall asleep.