Protesters shout slogans and hold banners in front of the House of Parliament, in Athens, Greece, May 1, 2013. Greece is in the grip of a new 24-hour general strike on Wednesday, as the country's largest unions of public and private sector workers ADEDY and GSEE mark Labor Day with anti-austerity rallies in central Athens and other major cities. (Xinhua/Marios Lolos) 

A woman takes part in a protest in front of the House of Parliament, in Athens, Greece, May 1, 2013. Greece is in the grip of a new 24-hour general strike on Wednesday, as the country's largest unions of public and private sector workers ADEDY and GSEE mark Labor Day with anti-austerity rallies in central Athens and other major cities. (Xinhua/Marios Lolos)

 Protesters shout slogans and hold banners in front of the House of Parliament, in Athens, Greece, May 1, 2013. Greece is in the grip of a new 24-hour general strike on Wednesday, as the country's largest unions of public and private sector workers ADEDY and GSEE mark Labor Day with anti-austerity rallies in central Athens and other major cities. (Xinhua/Marios Lolos) 

Protesters shout slogans and hold banners in front of the House of Parliament, in Athens, Greece, May 1, 2013. Greece is in the grip of a new 24-hour general strike on Wednesday, as the country's largest unions of public and private sector workers ADEDY and GSEE mark Labor Day with anti-austerity rallies in central Athens and other major cities. (Xinhua/Marios Lolos) 

Protesters shout slogans and hold banners in front of the House of Parliament, in Athens, Greece, May 1, 2013. Greece is in the grip of a new 24-hour general strike on Wednesday, as the country's largest unions of public and private sector workers ADEDY and GSEE mark Labor Day with anti-austerity rallies in central Athens and other major cities. (Xinhua/Marios Lolos) 

Protesters shout slogans and hold banners in front of the House of Parliament, in Athens, Greece, May 1, 2013. Greece is in the grip of a new 24-hour general strike on Wednesday, as the country's largest unions of public and private sector workers ADEDY and GSEE mark Labor Day with anti-austerity rallies in central Athens and other major cities. (Xinhua/Marios Lolos) 

Protesters shout slogans and hold banners in front of the House of Parliament, in Athens, Greece, May 1, 2013. Greece is in the grip of a new 24-hour general strike on Wednesday, as the country's largest unions of public and private sector workers ADEDY and GSEE mark Labor Day with anti-austerity rallies in central Athens and other major cities. (Xinhua/Marios Lolos)