In 1791, President George Washington faced a group of anti-tax activists—think today's Tea Party, but armed with guns—over a tax on whiskey created by Treasury Secretary Alexander Hamilton as a way to bring in revenue.
Congress passed the tax, but the farmers of western Pennsylvania who distilled and sold whiskey were outraged. Many were war veterans who contended they were fighting for the principles of the American Revolution, in particular against taxation without local representation. The federal government, on the other hand, said the taxes were legal under the taxation powers of Congress.
In July 1794, the whiskey rebels destroyed the home of a tax inspector. The rebellion grew in numbers and started to look like it would spread. Ultimately, Washington sent in 13,000 troops, who put down the rebellion.