Early in John Updike's first novel, The Poorhouose Fair,
from 1958, set in an old people's home, one of the
outspoken residents says: "Is he [the head administrator],
putting tags on us se we can be trucked off to the slaughterhouse?"
so, there's Updike, Vonnegut, Coetzee , TRP (in Against the Day)
and others, I'm sure.