"What we are headed for is a sort of social structure in which the highbrows are the elite, the middlebrows are the bourgeoisie and the lowbrows are hoi polloi."

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The whole struggle of our Party (and of the working class movement in Europe generally) must be directed against opportunism. The latter is not a current of opinion, not a tendency; it (opportunism) has now become the organised tool of the bourgeoisie within the working class movement.

— Vladimir Lenin