[aorth]

Paying—or at least filing—your taxes is the law in the USA. Generally speaking, breaking laws results in you losing some freedoms. I'm sure there are other crimes for which you would lose the right to travel out of the country.

Anyways, the article states that this would only apply in cases where an individual has over $50,000 in unpaid taxes. Statistically speaking, I don't imagine that very many people find themselves in that situation.

[yehi]

I don't know how many people fall in to the category, but some of the millions of American citizens living abroad may. While it is rare to be prosecuted, legally the fines can quickly pile up if while you are living abroad, you forget to report every cent that you own or partially own abroad.

[benchaney]

Generally speaking, in order to lose freedoms due to lawbreaking, the government must first prove beyond reasonable doubt that you have in fact violated the law. This does not appear to be the case here.