I am coming on briefly to clear this up. Unlike the Watchtower Society, we—as a group—have the advantage of being able to kindly self-correct with great speed. Apparently their holy spirit directions takes years to work whereas our brains and research skills make such leaps in record time.
The Watchtower Bible and Tract Society of New York, Inc. was involved in gross wrongdoing, according to their own published standards. However, it is VITALLY important that any exJW who talks about this issue gets the facts straight. Otherwise, we tend to provide support for the JW claims that apostates lie.
(1) There is nothing in JW doctrine that is violated by being anybody's NGO. The Watchtower Bible and Tract Society has been a non-governemental organization since it was incorporated under the name Zion's Watch Tower Society. They can be anyone's NGO without violating the principles they have published regarding neutrality.
(2) The Watchtower was never an Associate of the UN, nor were they the "UN's NGO." The UN Department of Public Information is not the UN. The Watchtower Society was never a part of the UN, nor did they join the UN. Any such statements are easily deniable and easily disprovable and will weaken anything else you have to say to an active JW.
(3) The Criteria for Association to the UN/DPI definitely made what they did far worse—according to their published standards of right and wrong—but the Criteria was not what made it wrong.
(4) "Associate" is a (widely understood) business world term describing a subordinate member to a superior organization. This may be a subordinate individual member or a subordinate organization member. THIS is what was wrong with their relationship to the UN Department of Public Information. The nature of the relationship was one of subordinate member to superior organization.
It was a deliberate and intentional joining (as an Associate) of the UN/DPI. This made them a "part of a secular organization that has objectives contrary to the Bible and, hence, is under judgment by Jehovah God." A direct violation of the standards set out in the book Organized to Do Jehovah's Will (od p. 155 par. 2) and in the book Organized to Accomplish Our Ministry (om p. 151 par. 1).
Please, if you are going to accuse the organization of gross sin be VERY SURE of your grounds. I encourage everyone to study up on NGOs is you are going to talk about this issue, just so you won't get tongue twisted. Or worse, tongue forked.
Non-governmental organization (Wikipedia)
World Bank definition, via Duke University