Greece

4 profiled groups with documented operations in Greece — 0 Extreme-band, 1 High-band, 3 Moderate or below. Presence here describes documented operations, not a judgement about Greece or its communities; many listed groups also operate elsewhere.

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Judaism

Sabbatean movement (Sabbatai Zevi)

The Sabbatean movement formed around Sabbatai Zevi (1626–1676), the Smyrna-born kabbalist proclaimed Messiah in 1665 with the decisive backing of the prophet-theologian Nathan of Gaza. Within a year it had swept the Jewish world from Yemen to Amsterdam — communities suspended commerce, sold property, and prepared for the return to the Land of Israel — making it the largest messianic mobilisation in Jewish history since antiquity. In 1666 Zevi, given the choice by the Ottoman court, converted to Islam; Nathan's theology reframed the apostasy as the Messiah's necessary descent into impurity. The movement's aftermath produced durable crypto-religious structures — the Dönmeh of Salonica outwardly Muslim and inwardly Sabbatean — and, a century later, the explicitly antinomian Frankist movement. Scored as a historical composite with low confidence, reflecting the source distance.

Christian

Genuine Orthodox Church of Greece (Old Calendar)

Schismatic Greek Orthodox jurisdictions that rejected the 1924 Greek Orthodox Church adoption of the Revised Julian Calendar. The largest body today is the 'Genuine Orthodox Church of Greece' under Archbishop Kallinikos (Synod of Kallinikos), with multiple smaller competing 'True Orthodox' synods (Lamia, Kiousis, Avlona).

Political / Ideological

Antifa (umbrella decentralised antifascist movement)

Decentralised militant-antifascist movement / loose network of autonomous cells, with no central leadership, membership system, or formal hierarchy. Participants identify with anti-fascist tactics (black-bloc protest, doxxing, no-platform / deplatform organising) and a broadly far-left worldview rather than with a specific organisation. Scored in the Moderate band (CLCI 14) per the BITE framework's operational-mechanics test, between mainstream-electoral-progressivism (CLCI 4) and various-far-left-cadre-sects (CLCI 21). Specific militant cells within the broader scene may score higher individually if researched as separate entries.

Christian

Eastern Orthodox Christianity

The communion of autocephalous Eastern Christian churches (Greek, Russian, Serbian, Romanian, etc.) is a low-CLCI mainstream tradition with rich liturgical life and broad lay autonomy outside the liturgy.

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