Greek fascist party Golden Dawn called a demonstration at the port of Piraeus near Athens on Friday night of last week.
Thousands of refugees are camping there.
Golden Dawn thugs attacked some of the anti-fascists assembling to counter them.
News footage of a Nazi thug attacking a camera operator was shown across Greece, with a prominent Golden Dawn MP clearly visible behind him.
An anti-fascist counter-protest meant the Nazis were unable to march.
Anti-racists, the shipping workers’ union and refugees are to hold a mass meeting in Piraeus on Wednesday of next week.