Property and income from your own labor rights. We're in danger here because our government believes it can confiscate any portion of our income in the form of taxes that it needs for Socialist programs and our property can be confiscated through very high property taxes.
The modern state, even one as limited as many conservatives would have it, can't be financed by modest tarrifs. Other taxes became an impossibility to avoid. The real injustice of such takings is in their forever changing and arbitrary application. If a tax is set and fixed, well then the value of the property, improvement, value added, or labor can be calculated by the buyer and seller. In our growing and arbitrary tax world, such is not possible and values decline.