Fritz Leiber 
The Wolf Pack [EPUB ebook] 

“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—”