Starting with the WTO,and through NAFTA to CAFTA to the FTAA, rules have been established regarding "the right of establishment" and the "national treatment" of migrants.
The right of establishment means that any country within the "free trade" area designated in the treaty has the right to establish business in any country in the "free trade area". That is why the article mentions the right of establishment, it is one mechanism for establishing open borders and unlimited immigration.
What the right of establishment does is force country's with migrant or temporary worker labor to give "national treatment" to the foreign nationals working in that country. National treatment means you must treat them the same as citizen workers, and allow them mobility to go to any job they want(no guest worker program that ties them to a specific employer, because that harms their economic freedom). The mobility issue could also be behind the push for illegal immgrant drivers licenses.
CAFTA clearly creates a "national treatment" and provides the "right of establishment" for professional workers, which is the camel's nose under the tent for other migrant labor in the hemisphere as soon as the FTAA is signed.
NAFTA has clear "right of establishment" and "national treatment" rules for Mexico. It is one proof that "free trade" promotes illegal immigration.
If you want to educate yourself about the fuzzy phrases that don't sound harmful to American sovereignty, but really are, I suggest you read up on how the "right of establishment" has harmed sovereignty in the EU, the "right of establishment" in the NAFTA, CAFTA, the FTAA and what "national treatment" means in "free trade" agreements.
Commission for Labor Cooperation http://www.naalc.org/english/review_part3.shtml
We have been so hung out to die. A beautiful country sold. It's price?.. Everything. Liberty, freedom, sovereignty, individual rights, rule of law, it's future...gone.