The ESPO (Greek: Ελληνική Σοσιαλιστική Πατριωτική Οργάνωσις, lit. 'Hellenic Socialist Patriotic Organization') was a collaborationist, pro-Nazi organization created in the summer of 1941 in German-occupied Greece, under the leadership of Georgios Vlavianos and later Dr. . Its members were ultra-nationalists, Nazis, and fascists aiming to help the Axis occupation forces against Communism and Jews. One of their main actions was the ransacking of the synagogue on , Athens, by the ESPO's youth section.