During the Axis Occupation of Greece, he co-founded a small leftist party, the Union of People's Democracy (ELD). He served as its general secretary, while the distinguished law professor Alexandros Svolos served as its president. In 1941, ELD joined the National Liberation Front (EAM), and Tsirimokos gained a seat in EAM's central committee.
During the Axis Occupation of Greece, he co-founded a small left-wing party, the Union of People's Democracy (ELD). He held the role of chief organizer for the group, while the distinguished law professor Alexandros Svolos served as its leader. In 1941, ELD joined forces with the National Liberation Front (EAM), and Tsirimokos was appointed to EAM's central committee.