Dock workers have gone on strike in Greece’s main port, Piraeus, preventing thousands of holidaymakers from catching ferries.
The strike was called to protest against planned reforms to pensions and labour laws.
The reforms were a condition of an economic rescue package from the EU and the International Monetary Fund (IMF).
The Greek government has promised to compensate tourists whose travel plans are disrupted by industrial action.
Communists are at the forefront of the industrial action, but they have widespread support from the general union movement, the BBC’s Malcolm Brabant reports from Athens.
Railway workers and state television employees were among those also striking on Wednesday.
Full story: BBC News – Tourists stranded by Greek strike in port of Piraeus