Pygmy by Chuck Palahniuk
Agent Number 67, nicknamed Pygmy for his diminutive size, arrives in the United States from his totalitarian homeland.
An 'exchange student' he is welcomed with open arms by his Midwestern host family. Simpsons-spinoffs, they introduce him into the rituals of postmodern American life, which he views with utter contempt.
Along with his fellow operatives, he is planning something big, something truly, truly awful, to bring this big dumb country's fat inhabitants to their knees.