O'Brien is a character from George Orwell's novel, 1984. He is a high-ranking member of the Party and serves as a complex figure who initially appears to be an ally to the protagonist, Winston Smith. O'Brien's role is pivotal in illustrating the themes of manipulation and control within a totalitarian regime. Throughout the story, O'Brien embodies the Party's oppressive ideology. He ultimately betrays Winston, revealing the harsh realities of the Party's power and the futility of rebellion. His character serves as a representation of the psychological tactics used by authoritarian governments to maintain dominance over individuals.