leveler

from WordNet (r) 3.0 (2006)

leveler
    n 1: a radical who advocates the abolition of social
         distinctions [syn: {leveler}, {leveller}]

from The Collaborative International Dictionary of English v.0.48

Leveler \Lev"el*er\ (-[~e]r), n. [Written also leveller.]
   1. One who, or that which, levels.
      [1913 Webster]

   2. One who would remove social inequalities or distinctions;
      a socialist.
      [1913 Webster]