It is worth recalling that Orwell. who was a socialist, saw 1984 as a satire on Stalinism in the Soviet Union. Big brother is clearly Stalin while Goldstein is Leon Trotsky who was murdered by an NKVD agent in 1940.
Orwell witnessed the horrors of the Stalinist secret police first hand when he was in Catalonia fighting to defend the workers revolution from Franco's fascist insurgency. He saw how Stalin used the NKVD and the Spanish Communist Party to instigate a civil war behind the front lines which helped to derail the revolution from within.
It is rarely mentioned in most analysis of the book that Orwell saw the working class as the agents of a future socialist society where oppression and wage slavery would become a thing of the past. In 1984 Winston Smith observes that the proles i.e. the working class are the only hope for the future.