Guldur Orcs

The Guldur-Orcs or Kazgûmhoth were the orc-tribe which adored the Necromancer of Dol Guldur.The Kazgûmhoth were effectively a coalition of a larger number of smaller tribes, among which the Blogrum-Hai,the Orcs of the Flame, Shirkag, Uruk-Harnak, Uruk-Thang and Uruk-Torg were the best-known.After the first defeat of the Necromancer by the White Council the Kazgûmhoth coalition was broken and much turmoil and inner strifes caused the emergence of smaller splinter-factions and lesser alliances.The Nazgûl Khamul the Easterling however had little trouble to reunite these bands under the Banner of the Eye and so at the end of the Third Age the Guldur-Orcs made up of the Bûrzthrâng, Durbúrz-stazg,Dushmau, Frûmhon, Hîshtgropor, Maukglob, Mirk-eaves Orcs, Taughâsh, Hîs-Urdan, Mor-Hai, Ûngund and several additional clans.

Movie Trilogy
The Movie trilogy shows the legions Guldur-Orcs as a well equipped and disciplined host, similar to the Black Uruks of Isengard and Mordor, though wearing somewhat different war-gear.