obstructionist

Noun

 * 1) Someone who systematically obstructs the actions of others.
 * 2) Someone who attempts to impede the progress of legislation.
 * 1) Someone who attempts to impede the progress of legislation.
 * 1) Someone who attempts to impede the progress of legislation.

Adjective

 * 1) Pertaining to obstructionism.
 * 2) Obstructionistic.