ATHENS, GREECE - JUNE 29 : Mounds of rubbish due to the ongoing municipal workers' strike are seen in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : Mounds of rubbish due to the ongoing municipal workers' strike are seen in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : A man walks past the mounds of rubbish due to the ongoing municipal workers' strike in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : People walk past the mounds of rubbish due to the ongoing municipal workers' strike in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : A woman walks past the mounds of rubbish due to the ongoing municipal workers' strike in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : A woman walks past the mounds of rubbish due to the ongoing municipal workers' strike in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : Fully loaded garbage cans are seen as cleaning workers attend a demonstration against municipalities that did not extend their contracts in Athens, Greece on June 26, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : Fully loaded garbage cans are seen as cleaning workers attend a demonstration against municipalities that did not extend their contracts in Athens, Greece on June 26, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : Fully loaded garbage cans are seen as cleaning workers attend a demonstration against municipalities that did not extend their contracts in Athens, Greece on June 26, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : Fully loaded garbage cans are seen as cleaning workers attend a demonstration against municipalities that did not extend their contracts in Athens, Greece on June 26, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : Fully loaded garbage cans are seen as cleaning workers attend a demonstration against municipalities that did not extend their contracts in Athens, Greece on June 26, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : Fully loaded garbage cans are seen as cleaning workers attend a demonstration against municipalities that did not extend their contracts in Athens, Greece on June 26, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : People march through the Interior Ministry as they stage a demonstration against municipalities that did not extend their contracts, at Karaiskaki Square in Athens, Greece on June 26, 2017. The POE-OTA union is holding a 24-hour strike and organized the march to the Interior Ministry to protest staff shortages that have resulted from the expiry of hundreds of short-term contracts. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : People march through the Interior Ministry as they stage a demonstration against municipalities that did not extend their contracts, at Karaiskaki Square in Athens, Greece on June 26, 2017. The POE-OTA union is holding a 24-hour strike and organized the march to the Interior Ministry to protest staff shortages that have resulted from the expiry of hundreds of short-term contracts. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : People march through the Interior Ministry as they stage a demonstration against municipalities that did not extend their contracts, at Karaiskaki Square in Athens, Greece on June 26, 2017. The POE-OTA union is holding a 24-hour strike and organized the march to the Interior Ministry to protest staff shortages that have resulted from the expiry of hundreds of short-term contracts. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : People march through the Interior Ministry as they stage a demonstration against municipalities that did not extend their contracts, at Karaiskaki Square in Athens, Greece on June 26, 2017. The POE-OTA union is holding a 24-hour strike and organized the march to the Interior Ministry to protest staff shortages that have resulted from the expiry of hundreds of short-term contracts. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : People march through the Interior Ministry as they stage a demonstration against municipalities that did not extend their contracts, at Karaiskaki Square in Athens, Greece on June 26, 2017. The POE-OTA union is holding a 24-hour strike and organized the march to the Interior Ministry to protest staff shortages that have resulted from the expiry of hundreds of short-term contracts. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : People march through the Interior Ministry as they stage a demonstration against municipalities that did not extend their contracts, at Karaiskaki Square in Athens, Greece on June 26, 2017. The POE-OTA union is holding a 24-hour strike and organized the march to the Interior Ministry to protest staff shortages that have resulted from the expiry of hundreds of short-term contracts. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 26 : People march through the Interior Ministry as they stage a demonstration against municipalities that did not extend their contracts, at Karaiskaki Square in Athens, Greece on June 26, 2017. The POE-OTA union is holding a 24-hour strike and organized the march to the Interior Ministry to protest staff shortages that have resulted from the expiry of hundreds of short-term contracts. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : Municipal workers shout slogans as they walk from Karaiskakis Square to parliamentary building, during a strike to demand extending their contracts from local authorities (Greek Union POE-OTA) in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : Municipal workers hold a banner as they take part in a strike to demand extending their contracts from local authorities (Greek Union POE-OTA) at Karaiskakis Square in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )

ATHENS, GREECE - JUNE 29 : Municipal workers shout slogans as they take part in a strike to demand extending their contracts from local authorities (Greek Union POE-OTA) at Karaiskakis Square in Athens, Greece on June 29, 2017. ( Ayhan Mehmet - Anadolu Agency )