That is exactly what that line (Dr. Strangelove) was about. The Birchers were very anti-fluoridation in the 1950s. They weren’t messing around. They put up billboards with — Get the US out of the UN and get the UN out of the US.
BTW the UN Building is on Rockefeller land that was donated to them. Turtle Bay in NYC.
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The city, in turn, spent $5 million ($51 million in 2023) on clearing the land. [9] Rockefeller donated the site to the UN in December 1946. [13] [14] [15] The UN accepted this donation, despite the objections of several prominent architects such as Le Corbusier. [13] [14]