Murray Leinster's "The Greks Bring Gifts" (novel, alien invasion): "Helpful" aliens with a nasty secret agenda
But Jim Hackett is noticing some anomalies in their behavior. While Aldarians are genuinely helpful, Greks' gifting feels like contempt, Grek ship is far too big compared to their declared numbers, his suspicion during his training in Grek science that they're being taught nonsense, ... His investigations, with the help of a small band of helpers, will unravel the aliens' nasty designs as well as a weapon to beat them at their own game.
- Damon Knight's "To Serve Man" (download text scans as part of a larger package): Similar concept at short story length.
Fact sheet.First published: 1964.
Included in "grubthrower"'s "Top 10 obscure but superb science fiction novels".
Related: Stories of Murray Leinster.