I think Farkel hit the nail on the head !
Please reread his post and think about it for a second, his explanation sounds the most probable and likely.
If it was true that they didn't need to be an NGO to use the UN library there must have been an other motive.
Of course they would have to recede the association fearing it might go public and it did in a big way thanks to the inter-net.
There is indeed corruption at the top of the Tower !