One of these days, thought Winston with sudden deep conviction, Syme will be vaporized. He is too intelligent. He sees too clearly and speaks too plainly. The Party does not like such people. One day he will disappear. It is written in his face.

George Orwell

1984. Part 1, Chapter 5. Winston thinks Syme will be vaporised because he knows too much. He knows that one day Newspeak is going to limit peoples’ thoughts and they won’t be able to think for themselves.