Athens saw its most serious unrest since the financial crisis began, as MPs passed austerity measures.
Rock-throwing protesters outside parliament clashed with police, who used tear gas to disperse them.
The BBC's Malcolm Brabant in Athens says the mood on the streets has degenerated after three months of relatively mild protests.
Trouble broke out after the leader of Greece's biggest union, Yannis Panagopoulos of the GSEE was attacked by three assailants, as he addressed demonstrators.
There have been clashes outside the parliament in Athens
TV pictures subsequently showed officers spraying gas into the face of veteran left-winger Manolis Glesos, who is in his mid-80s.
Mr Glezos is one of the country's most beloved figures because of his exploits during the World War Two, when he climbed the Acropolis walls to tear down the swastika during the Nazi occupation.
(The aftermath of Manolis Glezos' political persecution, from WWII to the Greek Civil War and the Regime of the Colonels is 11 years and 4 months of imprisonment, and 4 years and 6 months of exile. - Wikipedia)
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