Who is Syme? What does Winston think is going to happen to him? Why?

Syme is a "friend" of Winston's and a philologist working on the Eleventh Edition of the Newspeak Dictionary. Although Winston dislikes Syme, he enjoys having somewhat interesting conversations with him. Winston notices that Syme, although a devoted Party member, is too smart and too vocal for his own good. He predicts Syme will be vaporized, and is proven correct when he suddenly disappears.