I need to find a single word (noun) for a person who acts as a " work-stopper"

I need to find a word (noun) for a person who acts as a "work-stopper" and creates hurdles for others so that the work cannot be completed. For example, some government officials force people to follow long bureaucratic procedures to create delays or put-off the worker (use of delay-tactics).

Example sentence: David is a ...

Solution 1:

Consider obstructionist:

someone who systematically obstructs some action that others want to take
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An example of its use:

The self-absorbed obstructionist may be a perfectionist, a slow-moving tortoise, an indecisive type, or a complete slacker.
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