The IRS has a method of 'last resort' to collect overdue taxes: Revoking your passport

I wouldn't be surprised if there was a court test of this administrative policy before it reaches room temperature. Inasmuch as passports may be required for interstate travel on common carriers (especially airlines), this might be a violation of the due process provisions of the Constitution.

The new 87,000 IRS agents came after me for $6. So much for only going after those that make over $400K per year. More of taking our freedoms away.