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Public sector strike...Public sector workers and members of Unison gather outside the Houses of Parliament in central London as they take part in the one-day walkout as part of bitter disputes over pay, pensions, jobs and spending cuts. PRESS ASSOCIATION Photo. Picture date: Thursday July 10, 2014. Schools across England and Wales were facing closures and disruption today as teachers joined other public sector workers for a national strike. In total, more than a million people were taking part in the one-day walkout. The action has been hailed as the biggest strike over pay to hit the Government since it came to power in 2010. See PA story INDUSTRY Strike. Photo credit should read: Nick Ansell/PA Wire

Nick Ansell/PA

Public sector workers and members of the Unison union gather outside the Houses of Parliament in central London as they take part in the one-day walkout as part of disputes over pay, pensions, jobs and spending cuts. Read more

A striking worker wears a tyre around his neck as thousands of workers clad in red demonstrate on the first day of a nationwide strike called by South Africa's National Union of Metalworkers (NUMSA) in Johannesburg Central Business District on July 1, 2014. Nearly a quarter of a million members of South Africa's largest union downed tools on July 1, beginning an indefinite strike that threatens to bring the engineering sector to a halt. The strike is expected to hit more than 10,000 metals and engineering firms that account for about four percent of South African economic output, according to economists at Citigroup.

Mujahid Safodien/AFP

A striking worker wears a tyre around his neck as thousands of workers clad in red demonstrate on the first day of a nationwide strike called by South Africa’s National Union of Metalworkers (NUMSA) in Johannesburg Central Business District

Well-wishers greet the horse-drawn funeral cortege of RMT General Secretary Bob Crow as it arrives at the City of London Crematorium on March 24, 2014 in London, England. Mr Crow, the outspoken leader of the Rail, Maritime and Transport Workers Union, died of a suspected heart attack, aged 52, on March 11, 2014.

Oli Scarff/Getty Images

Well-wishers greet the horse-drawn funeral cortege of RMT General Secretary Bob Crow as it arrives at the City of London Crematorium on Monday in London, England. Mr Crow, the outspoken leader of the Rail, Maritime and Transport Workers Union, died of a suspected heart attack, aged 52, on March 11, 2014.

Port workers demonstrate outside the customs building in Buenos Aires, Argentina, Wednesday, Feb. 12, 2014. The protesters say the government is not paying retired port workers their state pension plan, affecting over 1,000 of their union members.

Victor R. Caivano/AP

Port workers demonstrate outside the customs building in Buenos Aires, Argentina. The protesters say the government is not paying retired port workers their state pension plan, affecting over 1,000 of their union members.

Firemen take part in a demonstration of Italian trade unions Cobas and Usb against austerity measures and European politics. Thousands of people protested against economic austerity in Rome today as partial transport strikes across the country cancelled dozens of flights and snarled buses and trains.

Filippo Monteforte/AFP

Firemen take part in a demonstration of Italian trade unions Cobas and Usb against austerity measures and European politics. Thousands of people protested against economic austerity in Rome today as partial transport strikes across the country cancelled dozens of flights and snarled buses and trains.

Union workers from Serikat Pekerja Seluruh Indonesia (SPSI) walk during a protest at the business district in Jakarta, October 17, 2013. Almost one thousand workers participated in the protest, demanding wage raises and objecting to outsourcing, according to local media on Thursday.

Beawiharta/Reuters

Members of trade union Serikat Pekerja Seluruh Indonesia walk during a protest in the business district in Jakarta. Almost 1,000 workers participated in the protest, demanding wage raises and objecting to outsourcing, according to local media on Thursday.

A man wearing a mask burns a flare on October 15, 2013 in Marseille, southern France, as he takes part in a protest called by French workers' unions (UNEF, UNL, CGT, FSU and FO), against the government's plans to reform France's retirement system.

Boris Horvat/AFP

A man wearing a mask burns a flare on Tuesday in Marseille, southern France, as he takes part in a protest called by French workers’ union, against the government’s plans to reform France’s retirement system.

An organiser walks on a large European Union flag is displayed front of Romania's Parliament Building to mark EU Day in Bucharest May 9, 2013. The flag measures 140 by 100 meters and weighs 800kg, according to organisers.

Bogdan Cristel/Reuters

An organizer walks on a large European Union flag displayed in front of Romania’s parliament building to mark EU Day in Bucharest. The flag measures 140m by 100m and weighs 800kg, according to organisers.