Link directly to UN for the Paul Hoeffel letter of explanation regarding the WBTS association as an NGO with UN/DPI:
http://www.un.org/dpi/ngosection/pdfs/watchtower.pdf
Notice this excerpt from the first paragraph of the Hoeffel letter:
By accepting association with DPI, the organization agreed to meet criteria for association, including support and respect of the principles of the Charter of the United Nations and commitment and means to conduct effective information programmes with its constituents and to a broader audience about UN activities. (red highlighting mine)
Notice this excerpt from the October 1, 1985 Watchtower magazine, page 11, paragraph 14:
When the nations not only rejected God's Kingdom but also established their own organization to bring peace, that was rebellion. When religious leaders of Christendom identified that organization with God's Kingdom and the Gospel, proclaiming it to be "the only available instrument" for bringing peace, that was idolatry. They were putting it in the position of God's Kingdom, "in a holy place." Certainly, it was "standing where it ought not." (Matthew 24:15; Mark 13:14) And religious leaders continue to support the League's successor, the United Nations, rather than point men to God's established Kingdom. (red highlighting mine)
And from page 6 of the same magazine: 'The whole world lies in the power of the wicked one.' This includes the United Nations
Evidently the WBTS wanted it both ways...point men to God's established Kingdom while at the same time supporting "the blasphemous counterfeit of God's Messianic Kingdom" (Revelation -- Its Grand Climax At Hand! book, page 248, paragraph 9) under the control of Satan. Wonder how many blessings the WBTS got for playing both sides for 10 years.