This is a tricky one. There is no simple rule. As FD says, it is often a feeling about how the sentence sounds. It is much more a matter of style than grammar. I don't think we can make generalisations about the use of the apostrophe with institutions, etc. I don't see anything wrong with "the organisation's concerns..." for example. About the only really obvious rule is that simple possessive phrases involving names of people almost always use the apostrophe s: John's sister, not the sister of John. But even here "of" might be used if the 's sounds awkward, e.g. the brother of Jesus. And even when the use of "of" is normal, such as "the Queen of England", it's not impossible to say "England's queen" - a subtle distinction that is easier to understand than to explain! Compare "the Bank of England" with "England's banks"...
Conclusion: there is no conclusion...
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