 Water fluoridation has frequently been the subject of conspiracy theories.During the "Red Scare" in the United States during the late 1940s and 1950s, and to a lesser extent in the 1960s, activists on the far right of American politics routinely asserted that fluoridation was part of a far-reaching plot to impose a socialist or communist regime.These opponents believed it was "another aspect of President Truman's drive to socialize medicine."