Municipal workers clashes with riot police during a demonstration against the presence of a German deputy labour minister Hans-Joachim Fuchtel, in Thessaloniki on November 15, 2012.
(CNN) -- The nation of Greece has come to a screeching halt again.
Unions have called for a 48-hour general strike beginning Tuesday ahead of an anticipated vote by the Greek government on yet another round of austerity measures the following day.
Protesters filed past parliament, their banners and Greek flags flapping in the air over their heads.
Greek media are expecting a cliffhanger in parliament late Wednesday night, with passage of the austerity measures by just a handful of votes.
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If legislators do not pass the measures, it will endanger the payout of the next international bailout installment of 31.5 billion euros, which the government desperately needs to stay in operation. Without the funds, it says it will run out of money by mid-November.
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But Greeks are furious about the effects of multiple rounds of belt-tightening, which have resulted in cuts to pensions and pay and seen unemployment in Greece's fifth year of recession soar to over 25%.
More than one-fifth of the population could face poverty, defined as a family of four on an income of 13,842 euros (about $17,500) per year, state news agency AMNA has reported.
Critics of austerity have called for economic stimulus programs instead, like those implemented in the United States.
The two-day general strike will shut down transportation across the country, including ships and taxis, said AMNA, which is joining the strike along with other media outlets for four and a half hours Tuesday.
Hospitals are striking both days, and pharmacies will close all day Wednesday. Government offices are shuttering for the extent of the strike.
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About 35,000 demonstrators turned out in Athens, Greek police spokesman Panagiotis Papapetropoulos said.
The street protest remained peaceful, without any of the disturbances that have marred other demonstrations in recent months.
Wednesday is expected to draw the larger crowd of demonstrators as the vote approaches.
If Greece is to stay the course laid out by the so-called troika -- the European Commission, the European Central Bank and the International Monetary Fund -- more budget cuts will be necessary, as the country's debt woes are worse than previously believed.
Recent budget projections for the Greek government exceed the worst-case scenarios envisioned by international lenders when they agreed to a bailout, according to a Financial Times report published by CNN.
The hardship many Greek people are suffering has resulted in dogged opposition in parliament to deeper cuts, including within the ruling coalition.
The Democratic Party of the Left, or DIMAR, one of three parties making up the coalition headed up by Prime Minister Antonis Samaras, has said it will abstain in the vote on the new round of austerity measures, turning in blank ballots. But it plans to vote Sunday to approve the government's new budget.
Samaras' own center-right New Democracy party is expected to vote in favor of the package.
Although the third coalition member -- the socialist party Pasok -- supports the cuts, individual party members have come out against them and could defect, putting the vote in jeopardy.
Radical leftist party Syriza, bitterly opposed to austerity and closely connected to Greek unions, calls on its website for Greeks to demonstrate against the "rape" of democracy and the dashing of the hopes of the people.
Samaras warned that if the measures don't pass and international funds don't arrive, the nation could plunge into chaos. He is pushing for Greece to receive more than the 31.5 billion euros expected in the latest installment "so that there is a significant effect on the real economy."
Greece, and particularly Athens, has seen repeated street demonstrations against the austerity measures imposed on the nation, some of which have turned violent.
Journalist Elinda Labropoulou contributed to this report.
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Riot police guard the Parliament building during a demonstration against austerity measures as Greek deputies consider a budget vote on November 11, 2012.
A portrait of German Chancellor Angela Merkel is roped and hung outside the Greek Parliament during a protest against austerity measures in Athens on November 11, 2012.
Protesters demonstrate outside the Greek parliament against the new austerity measures in Athens on November 11, 2012.
Greek Prime minister Antonis Samaras (R) votes yes for approval of the 2013 budget at the Greek parliament in Athens on November 12, 2012 .
A protester kicks away a tear gas canister during a demonstration in Athens on November 7, 2012.
A man runs away from clashes between protesters and riot police outside the parliament in Athens on November 7, 2012.
Petrol bombs exploded during a demonstration in Athens on November 7, 2012.
A dog sleeps in a deserted commercial street in central Athens on November 7, 2012 during a 48-hour general strike.
Demonstrators stand in front of the Greek Parliament in Athens on November 7, 2012 during a 48-hour general strike.
Wheelchair users protest against a new government austerity bill in Thessaloniki on 7 November, 2012.
Thousands of Greeks protested against further austerity measures in Athens on Tuesday, November 6, ahead of a crucial Parliamentary vote on emergency cuts and tax increases.
Police estimate that about 35,000 people turned out for a peaceful protest in Athens.
Demonstrators shout slogans against new austerity measures required for the bailout package.
Riot police stand guard as demonstrators march in front of the Greek parliament in central Athens during the protests on November 6, 2012.
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