Iron Claw were a range of miniatures designed by Bob Olley. First announced in White Dwarf 91, the first releases were the IC201 Skeleton Guard in White Dwarf 93. They were manufactured and distributed by Citadel and appeared during 1987-8. When Bob and Citadel parted company many of these pieces were assimilated into the main Citadel lists. The Goblins and Black Orcs, for instance, formed the bulk of those pictured in the 1990 Fantasy catalog.
For the definitive guide to all things Iron Claw see Tony Mansfield's Bob Olley wiki.