Columbia subject headings:
Harvard subject headings:
Ergatiko Ethniko Apeleutherōtiko Metōpo.
Ergatikon Kentron Athēnōn (Athens, Greece)
Ergatikos Antiphasistikos Synaspismos.
Labor movement--Greece--History--20th century.
Syndicalism--Greece--20th century.
Working class--Greece--History--20th century.
Princeton subject headings:
Labor movement--Greece--History--20th century.