Nineteen Eighty-Four by George Orwell.

Part 1, Chapter 7

"If there is hope, wrote Winston, it lies in the proles.

If there was hope, it must lie in the proles, because only there in those swarming disregarded masses, 85 per cent of the population of Oceania, could the force to destroy the Party ever be generated. The Party could not be overthrown from within. Its enemies, if it had any enemies, had no way of coming together or even of identifying one another. Even if the legendary Brotherhood existed, as just possibly it might, it was inconceivable that its members could ever assemble in larger numbers than twos and threes. Rebellion meant a look in the eyes, an inflexion of the voice, at the most, an occasional whispered word. But the proles, if only they could somehow become conscious of their own strength, would have no need to conspire. They needed only to rise up and shake themselves like a horse shaking off flies. If they chose they could blow the Party to pieces tomorrow morning. And yet!"