lynching

from WordNet (r) 3.0 (2006)

lynching
    n 1: putting a person to death by mob action without due process
         of law

from The Collaborative International Dictionary of English v.0.48

Lynch \Lynch\, v. t. [imp. & p. p. {Lynched}; p. pr. & vb. n.
   {Lynching}.] [See Note under {Lynch law}.]
   To inflict punishment upon, especially death, without the
   forms of law, as when a mob captures and hangs a suspected
   person. See {Lynch law}.
   [1913 Webster]