lunatic fringe

from WordNet (r) 3.0 (2006)

lunatic fringe
    n 1: a political unit with extreme and fanatical views

from The Collaborative International Dictionary of English v.0.48

lunatic fringe \lunatic fringe\ n.
   the members of a political or social group espousing extreme,
   fanatical, or seemingly irrational views.
   [PJC]

from Jargon File (4.4.4, 14 Aug 2003)

lunatic fringe
 n.

   [IBM] Customers who can be relied upon to accept release 1 versions of
   software. Compare {heatseeker}.

from The Free On-line Dictionary of Computing (8 July 2008)

lunatic fringe

   [IBM] Customers who can be relied upon to accept release 1
   versions of software.

   [{Jargon File}]

from Moby Thesaurus II by Grady Ward, 1.0

39 Moby Thesaurus words for "lunatic fringe":
      Bolshevik, Jacobin, Wobbly, aficionado, anarchist,
      anarcho-syndicalist, buff, bug, crank, devotee, energumen,
      enthusiast, extreme left-winger, extremist, fan, fanatic, fanatico,
      freak, infatuate, left-wing extremist, mild radical, monomaniac,
      nihilist, nut, parlor Bolshevik, parlor pink, pink, pinko, radical,
      red, revolutionary, revolutionist, sans-culotte, subversive,
      syndicalist, ultra, ultraist, yippie, zealot