Source : Webster's Revised Unabridged Dictionary (1913)

Leveler \Lev"el*er\ (-[~e]r), n. [Written also leveller.]
   1. One who, or that which, levels.

   2. One who would remove social inequalities or distinctions;
      a socialist.

Source : WordNet®

leveler
     n : a radical who advocates the abolition of political or
         economic or social inequalities [syn: {leveller}]