Other measures already announced include the non-replacement of departing civil servants and the tax crackdown.
Greece is one of several EU countries struggling with a gaping deficit and heavy debt, preventing them from spending their way out of recession.
Greece's deficit is, at 12.7%, more than four times higher than eurozone rules allow. Its debt is about 300bn euros ($419bn, £259bn).
The possibility of Greece or one of the other stricken countries being unable to pay its debts - and either needing an EU bailout or being forced to abandon the euro - has been called the biggest threat yet to the single currency.
But union members complain that the Greek government has bowed to the markets and pressure from the EU.
Farmers have already been protesting for weeks, demanding more government assistance.
Civil servants are planning a strike next week and the country's biggest union, GSEE, voted on Thursday to hold a mass walk-out on 24 February.
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