Fritz Leiber 
The Wolf Pack 

“Finally, something you all know about—this epidemic of what we’ve called convulsive accidents. Cases of mild poisoning and electric shock, with the victim suffering muscular spasms and going into a hazy and unrealistic mental state that sometimes lasts for days. There have been altogether too many of those ‘accidents.’ It’s as if there were a silent wolf pack around us—dozens of the red-eyed beasts—”