I don't know if this has been posted, quite frankly it gets confusing. If it has been posted I am sorry if it hasn't hopefully it will help. I took this from the 1986 Watchtower 10/01 page 20. It first describes the wild beast and what the heads and horns mean. Then it goes on to say, and I quote:
"Upon its back there rides a woman, "Babylon the Great, the mother of the harlots and of the disgusting things of the earth."....She commits spiritual harlotry by getting involved in politics. Religion's linking up with the UN in the world's campaign for peace and security is an example of this."
Also I found in the September 1, 1987 Watchtower page 20:
"The United Nations is actually a worldy confederacy against Jehovah God and his dedicated Witnesses on earth today. .........scheming up what they may do against the visible organisation of Jehovah God on earth."
And this one is a winner. This one was found in the September 1, 1989 Watchtower page 6 (This page number was disappointing because it was not page 20. I was thinking that there must have been some significance to them putting most on the UN stuff on page 20.) The name of this article is "FULL OF BLASPHEMOUS NAMES" It goes on to say:
"Ascribing to human organisations things that God's Kingdom alone will accomplish is blasphemous. Thus, the Bible foretells that after a short existence, the United Nations will go "off into destruction." Only God's perfect heavenly government can bring lasting peace to mankind."
I have more article to look through but this but a few that I have come across that I felt were important.