Indeed, as the nascent United States was still being formed, the Whiskey Rebellion of 1794 may be considered to be the first effort for tax reform in the United States. President George Washington himself led 12,950 troops to western Pennsylvania to put down the rebellion.
One organization trying to affect tax policy in the United States in 2003 is Americans for Tax Reform. They have high-level sympathizers in the administration of George W. Bush, the 43rd US President.