Mobocracy!

mobocracy n. 1. When people you disagree with exercise a hint of possible political power.

"When the rule of law is dictated by a mob of illegal aliens taking to the streets, especially under a foreign flag, then that means the nation is not governed by a rule of law -- it is a mobocracy."
-Jim Gilchrist, a founder of the Minuteman Project (NYT, 5/2/06)