A história é "Tempo em avanço" por William Tenn .
"Here we are, ladies and gentlemen of the television audience," the announcer exuded in a lavish voice. "We are on board the convict ship Jean Valjean, which has just landed at the New York Spaceport. We are here to meet two men — two of the rare men who have managed to serve all of a voluntary sentence for murder and thus are legally entitled to commit one murder apiece.
"In just a few moments, they will be discharged after having served out seven full years on the convict planets — and they will be free to kill any man or woman in the Solar System with absolutely no fear of any kind of retribution. Take a good look at them, ladies and gentlemen of the television audience — it might be you they are after!"