Around 50 members of Golden Dawn were reportedly detained at the Acropolis on Saturday for distributing leaflets to visitors which claimed that the party is suffering from political persecution.
The leaflets were in English, French and German, and were being distributed at the archaeological site.
A few hours earlier, supporters of the neo-Nazi party were suspected of throwing rocks and other items at an anarchist squat in Maroussi, northern Athens.
The assailants were on motorcycles and were reportedly on the way back from a memorial service for two Golden Dawn members murdered outside the party’s offices in nearby Neo Iraklio nine months ago.
The riot squad was called in to ensure there were no clashes.