a person who deliberately delays or prevents progress.
a person who delays or obstructs the business before a legislative body by parliamentary contrivances or legalistic maneuvers.

1840–50; obstruction + -ist

obstructionism, noun
obstructionistic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
obstructionist (əbˈstrʌkʃənɪst)
a.  a person who deliberately obstructs business, esp in a legislature
 b.  (as modifier): obstructionist tactics

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
In others they smashed the old obstructionist committees and formed new ones.
But the peace plan continues to have its own momentum despite the
  administration's obstructionist tactics.
But, of course, the way to win concessions from obstructionist opponents isn't
  to sound them out quietly.
Show the world how far you'll go to be an obstructionist and how often you'll
  do it.
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