Do you remember the movie "Spartacus"?
After a heroic resistance, the Roman slaves and gladiators are finally conquered. The Roman general who defeats them tells the thousands of seated survivors in Spartacus' army, "You have been slaves. You will be slaves again, but you will be spared your rightful punishment of crucifixion by the mercy of the Roman legions. All you need do is to turn over to me the slave Spartacus because we do not know him by sight."