Malakh Empire

The Malakh were a race who were at war with the Uvodni. The two races fought the Ghost Wars against each other, the Uvodni backed by an alliance of other races who were later crushed. Because of this, the Uvodni started abducting human children from Earth and using them as soldiers. The two races eventually declared a truce and the war ended. The Malakh were known to Sarah Jane Smith, who considered them to be easily provoked. (TV: Warriors of Kudlak)

Behind the scenes
The Mal'akh (note the apostrophe) are a race in the Faction Paradox universe, Lawrence Miles' quasi-spin-off of Doctor Who. They are basically the Faction Paradox analogues of Doctor Who's vampires. The two species are probably unrelated, and this Wiki does not consider Faction Paradox to be part of Doctor Who canon.