Final answer:
The alleged traitor introduced during the 2-Minute Hate in George Orwell's '1984' is Emmanuel Goldstein, a character designed as a focal point for the citizens' hatred to ensure their loyalty to Big Brother.
Step-by-step explanation:
The alleged traitor whose face is shown to start the 2-Minute Hate in George Orwell's novel 1984 is Emmanuel Goldstein. In the book, Goldstein is portrayed as a renegade and traitor, and he is used as the focal point of the citizens' hatred and anger during the daily events of the 2-Minute Hate. This intense display serves as a way for the Party to channel and reinforce the public's negative emotions and loyalty to Big Brother.