There is a growing movement in the United States of Americans that call into question the constitutionality of the Federal Income tax in the modern age.
Understanding that the income tax first came into being to help fund the military in war time, the fact that the tax continued into peace time and has become the core of our tax system to this day has some questioning if there is a constitutional basis for such a tax.
What are the arguments for this belief and have there been any Supreme Court cases where this very question was asked?