The Collaborative International Dictionary of English v.0.48:

Brutalization \Bru`tal*i*za"tion\, n.
   The act or process of making brutal; state of being
   brutalized.
   [1913 Webster]

WordNet (r) 3.0 (2006):

brutalization
    n 1: the condition of being treated in a cruel and savage manner
         [syn: brutalization, brutalisation]
    2: the activity of treating someone savagely or viciously [syn:
       brutalization, brutalisation]
    3: an act that makes people cruel or lacking normal human
       qualities [syn: brutalization, brutalisation,
       animalization, animalisation]