"The Tactful Saboteur" is a novelette by the science fiction author Frank Herbert which first appeared in Galaxy Science Fiction magazine in October 1964. It is notable for establishing the setting for Herbert's ConSentiency universe.

Jorj McKie finds the last of the powerful Caleban species, damaged and fading, who must be freed from a power threatening all sentient life.

Beyond the God Wall Generations of a tormented human-alien people, caged on a toxic planet, conditioned by constant hunger and war-this is the Dosadi Experiment, and it has succeeded too well. For the Dosadi have bred for Vengeance as well as cunning, and they have learned how to pass through the shimmering God Wall to exact their dreadful revenge on the Universe that created them . . .