We, the Marauders — Robert Silverberg

The beings that dwelt on Ganymede didn't use metals, but they didn't want to deal with Earthmen, either; and Earth needed those metals. The Ganymedeans were harmless primitives, but that wouldn't do; pacifying such aliens, and grabbing their metal, wouldn't go with the public. So Ted Kennedy, of the Steward & Dinoli agency, found himself assigned to produce the biggest sell in history -- convince the public that the Ganymedeans were not pathetic, somewhat cute, aliens, but vicious monsters that had to be subdued!

This very early work by science fiction Grandmaster Robert Silverberg showcases a young author developing his skills, and gives hints of the great talent that would fully manifest in later years. Over fifty years after its publication, many of this story's themes retain their relevance and make for an unforgettable reading experience!