Golden Dawn (GD), Greece’s most prominent far-right political organization, strategically utilized antisemitism as its core ideological principle rather than a marginal prejudice or rhetorical device. This article argues that antisemitism served primarily as an epistemological conspiratorial framework central to GD’s ideological worldview, providing a coherent interpretive lens through which all political, economic, and social phenomena were explained as elements of a singular Jewish-orchestrated plot. Drawing on qualitative discourse analysis of over 10,300 GD publications spanning 1993 to 2020, the study illustrates how this epistemological master frame enabled the party to unify diverse domestic and international issues, from foreign policy tensions and immigration debates to economic crises, under a consistent antisemitic narrative. Additionally, by explicitly employing Holocaust denial, endorsing Nazi symbolism, and openly propagating antisemitic conspiracies, GD deliberately violated post-Holocaust European norms. This normative transgression was integral to the party’s identity, positioning it in overt defiance of mainstream moral and political boundaries. The article thus demonstrates how GD’s antisemitism functioned not merely as a rhetorical provocation but as the foundation of a comprehensive ideological system that consciously challenged established European taboos. These findings also suggest broader implications for understanding the role and adaptability of conspiratorial antisemitism and normative transgression in other extremist ideologies beyond the Greek context.