The Uggli Brothers gang was a group of pirates, centered on Kiffex. Most of their members did, in fact, have deformities or were otherwise unattractive examples of their species.
In the German translation of this story, "Uggli brothers" was translated as "hässliche Brüder," which means "ugly brothers."
In the German translation of this story, "Uggli brothers" was translated as "hässliche Brüder," which means "ugly brothers."