The preservation of printed material, oral testimonies, visual and archival collections is a pivotal activity of ASKI. These collections elucidate the historical trajectory of the Greek Left, the labor movement and progressive politics from the 19th century to the present day. The archival collections are kept at the ASKI repository, which is located in the center of Athens (1 Eleftherias Square), and are accessible to researchers, readers and the general public. The core archival collections (numbering more than 5 million documents) are organized along the following series:

Records of the Parties of the Greek Left

Greek Communist Party (KKE): 1943–1968

Greek Communist Party–Interior (KKE Esoterikou): 1968–1986

United Democratic Left (EDA): 1952–1967

Greek Left (EAR): 1986–1989

Records from various groups of the Radical Left: 1974–2014

World War II, Greek Civil War and Post-War Activities of the Greek Left

Axis Occupation and National Resistance in Greece (1941–1944): Resistance groups, collaboration, social and economic issues.

Greek Civil War (1946–1949): Military activities, political developments, international relations.

Political refugees in Eastern European countries (1949–1978): living conditions and political activities, relations with respective host countries.

Political repression and political prisoners in Greece (1936–1974): international anti-communist networks, prisoners’ living conditions, relations with inmates, and correspondence with relatives.

Military dictatorship in Greece (1967–1974)

Anti-dictatorship movements in Greece and worldwide: underground organizations, solidarity committees and groups in Western Europe and the USA.

Cyprus: labor movement, invasion of the Turkish army (1974), relations of the Greek Communist Party with the Progressive Party of Working People (AKEL).

Civil rights, social movements, grassroots organizations (1950–2014)

Working-class movements and trade unions in Greece and abroad Youth and student movement, protest culture and social dissent Feminist, ecological and antinuclear movements and groups.

Personal archives of Greek politicians, intellectuals and trade-unionists