Where should the apostrophe be for the possessive form when I enter the full name of the organization and its acronym between parentheses immediately after?

In this situation, my advice is to reWord so that the first mention of the organization is not possessive. Clarity is a virtue and identifying the organization by name and acronym is enough for one bite to handle without adding what it possesses. If after that admonishment you still feel the need to use an apostrophe in the first use of the term, rethink. Can you rephrase the sentence in such a way that you can separate the it (the organization and its acronym) from what it has? For example, instead of trying to say "The North American Free Trade Agreement's (NAFTA's) provisions are..." say "The provisions of the North American Free Trade Agreement (NAFTA) are..." If you're a stubborn cuss that just won't heed advice than I've given my best advice above of how to incoporate naming and using possessives in my example, but I reiterate REWord the sentence!!!! Reworking the sentence is the best answer, and with tweeking any sentence you're composing can be tweeked so that nominal is separated from possessive.