This was a resolution made by JWs at assemblies around the world and published in the Watchtower 1963 10/15
"This Resolution stressed that Jehovah’s witnesses recognize that the one true God is Jehovah, that the Bible is his written Word, that Jehovah God is the Sovereign of the Universe, that men and nations have set up the United Nations rather than surrender to the sovereignty of God’s Messianic Kingdom, and that though nations have given idolatrous worship to that political image, this Jehovah’s witnesses refuse to do. The Resolution showed that radical governments have been formed, but that “We, as witnesses of God, the Source of life, will maintain our Christian steadfastness and have no part in such radical movements, but will hold fast to our Christian neutrality toward all radical and other types of human government over earth.” It stressed that the nations are being led by invisible wicked spirits to Armageddon, but that “we will not march with them to Har–Magedon, for we refuse to fight against God Almighty and his kingdom.” Jehovah’s witnesses, it was resolved, will continue to declare to all the ‘everlasting good news’ concerning God’s Messianic Kingdom"
They stated that they would have no part of it.