"Iron Golem" goliaths are more heavily armed and armored versions of the standard goliath, employed by Martin's Marauders, a mercenary organization.
General Martin offered their services to the Terran Dominion in its battle with the New Trinidad Pirates.
1999-03-26. StarCraft. Vivendi Games. Mission: Mercenaries (in English). Map Archives: Mercenaries. StarCraft Compendium Map Archives.