In essence, the Birchist worldview allowed adherents to hold typically right-wing policy preferences simultaneous with the belief that the Society's opponents, including many bona fide conservatives, were secretly part of the “communist conspiracy.”
Source: wiktionary
The Birchists (like the Marxists who have forgotten Marx) have fallen victim to the devil theory of history.
Source: wiktionary
The liberal accuses the conservative of being a “Birchist,” an “extremist,” or an “ultra-rightist.” The conservative, alarmed at being skewered and roasted as an irresponsible fascist, strikes back by citing his family’s war record against the Nazis
Source: wiktionary