Who obstructed the administration of justice by refusing his assent to laws for establishing judiciary powers?

The person who obstructed the administration of justice by refusing his assent to laws for establishing judiciary powers was King George III of Great Britain. His actions were viewed by the American colonists as a violation of their rights and contributed to rising tensions leading up to the American Revolution. This refusal was one of the grievances listed in the Declaration of Independence, highlighting the colonists' frustrations with British rule.