Emmanuel Goldstein's Book sums up the support for equality in this way:

The aim of the High is to remain where they are. The aim of the Middle is to change places with the High. The aim of the Low, when they have an aim -- for it is an abiding characteristic of the Low that they are too much crushed by drudgery to be more than intermittenly conscious of anything outside their daily lives -- is to abolish all distinctions and create a society in which all men shall be equal.

Was Goldstein right in his assumption that equality is mainly advocated by proles? Martin Regnen has the answer in his latest column: Who Loves Equality?