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Brazilian Indian Hunikui Ninawa participates in the National Day of Struggle, a march by unionists, in Brasilia July 11, 2013. Union demonstrations snarled traffic in several Brazilian cities on Thursday morning as part of a one-day strike aimed at seizing the momentum of sweeping protests that shook Latin America's largest economy last month. REUTERS/Ueslei Marcelino ( BRAZIL-STRIKE/ )

Striking workers march in Sao Paulo, Brazil, Thursday, July 11, 2013. Workers across Brazil walked off their jobs on Thursday in a peaceful nationwide strike demanding better working conditions and improved public services. Metalworkers, transportation and construction workers as well as teachers and civil servants adhered to the "Day of Struggle" organized by Brazil's biggest trade union federations. (AP Photo/Andre Penner) ( Brazil Protests )

Members of various labour unions block a street, in Sao Paulo, Brazil, on July 11, 2013 during a protest to lower public transport rates, to increase public investments in health and education, to reduce working hours and land reform, among other claims. Miguel Schincariol/AFP/Getty Images ( 521285778 )

Members of various labour unions take part in a demonstration in front National Congress in Brasilia, Brazil, on July 11, 2013 during a day of strikes and demonstrations called by the country's five leading labor federations to demand better public services and an end to endemic corruption.. EVARISTO SA/AFP/Getty Images ( 521292006 )

People hold a MST banner during the National Day of Struggle, a march by unionists, in Brasilia July 11, 2013. Union demonstrations snarled traffic in several Brazilian cities on Thursday morning as part of a one-day strike aimed at seizing the momentum of sweeping protests that shook Latin America's largest economy last month. The banner reads, "MST - agrarian reform now!" REUTERS/Ueslei Marcelino ( BRAZIL-STRIKE/ )

Brazilian workers march in Rio de Janeiro on July 11, 2013 in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. VANDERLEI ALMEIDA/AFP/Getty Images ( 521291373 )

A demonstrator carries flag of the Central Union of the Workers (CUT) during a protest by unions in Brasilia, Brazil, Thursday, July 11, 2013. Workers across Brazil walked off their jobs on Thursday in a peaceful nationwide strike demanding better working conditions and improved public services. Metalworkers, transportation and construction workers as well as teachers and civil servants adhered to the "Day of Struggle" organized by Brazil's biggest trade union federations. (AP Photo/Eraldo Peres) ( Brazil Protests )

Members of labor unions block a main highway on the National Day of Struggle, in Porto Alegre July 11, 2013. Union demonstrations snarled traffic in several Brazilian cities on Thursday morning as part of a one-day strike aimed at seizing the momentum of sweeping protests that shook Latin America's largest economy last month. REUTERS/Edison Vara ( BRAZIL-PROTESTS/ )

A child holds up a flag as members of labor unions hold a demonstration on the National Day of Struggle, in Belem July 11, 2013. Union demonstrations snarled traffic in several Brazilian cities on Thursday morning as part of a one-day strike aimed at seizing the momentum of sweeping protests that shook Latin America's largest economy last month. The poster (R) reads, "Against the privatization of university hospitals." REUTERS/Paulo Santos ( BRAZIL-PROTESTS/ )

Brazilian workers pose as they march in Rio de Janeiro on July 11, 2013 in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. VANDERLEI ALMEIDA/AFP/Getty Images ( 521289140 )

Members of various labour unions take part in a demonstration in front National Congress in Brasilia, Brazil, on July 11, 2013 during a day of strikes and demonstrations called by the country's five leading labor federations to demand better public services and an end to endemic corruption.. EVARISTO SA/AFP/Getty Images ( 521292039 )

Workers march during a strike carrying a sign that reads in Portuguese "National day of mourning" in Sao Paulo, Brazil, Thursday, July 11, 2013. Workers across Brazil walked off their jobs on Thursday in a peaceful nationwide strike demanding better working conditions and improved public services. Metalworkers, transportation and construction workers as well as teachers and civil servants adhered to the "Day of Struggle" organized by Brazil's biggest trade union federations. (AP Photo/Andre Penner) ( Brazil Protests )

Brazilian workers march in Rio de Janeiro on July 11, 2013 in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. VANDERLEI ALMEIDA/AFP/Getty Images ( 521291255 )

Masks of Guy Fawkes are sold in the streets of Rio de Janeiro as Brazilian workers march on July 11, 2013 in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. CHRISTOPHE SIMON/AFP/Getty Images ( 521291094 )

Riot police officers stand guard outside the National Theatre in Rio de Janeiro on July 11, 2013 as Brazilian workers march in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. CHRISTOPHE SIMON/AFP/Getty Images ( 521290992 )

Riot police officers fire tear gas at violent demonstrators after clashes erupted following a march by Brazilian workers in Rio de Janeiro on July 11, 2013 in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. CHRISTOPHE SIMON/AFP/Getty Images ( 521292256 )

People look through the windows of a building as violent demonstrators clash with the riot police after a march by Brazilian workers in Rio de Janeiro on July 11, 2013 in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. CHRISTOPHE SIMON/AFP/Getty Images ( 521292285 )

Protesters clash with riot police during the "National Day of Strikes, Stoppages and Protests" in downtown of Rio de Janeiro July 11, 2013. Tens of thousands of union demonstrators blocked roads and snarled traffic in dozens of Brazilian cities on Thursday in a one-day strike aimed at seizing the momentum of huge protests that swept the country last month. Protesters on Thursday demanded more labor rights while echoing the calls last month for greater investment in public health, education and transportation. REUTERS/Sergio Moraes ( BRAZIL-STRIKE/ )

Riot police officers are deployed in Rio de Janeiro on July 11, 2013 after clashes erupted in parts of the city following a march by Brazilian workers in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. CHRISTOPHE SIMON/AFP/Getty Images ( 521292590 )

Riot police clash with demonstrators during the "National Day of Strikes, Stoppages and Protests" in downtown of Rio de Janeiro July 11, 2013. Tens of thousands of union demonstrators blocked roads and snarled traffic in dozens of Brazilian cities on Thursday in a one-day strike aimed at seizing the momentum of huge protests that swept the country last month. Protesters on Thursday demanded more labor rights while echoing the calls last month for greater investment in public health, education and transportation. REUTERS/Sergio Moraes ( BRAZIL-STRIKE/ )

A riot police officer fires rubber bullets as he clashes with demonstrators during the "National Day of Strikes, Stoppages and Protests" in downtown of Rio de Janeiro July 11, 2013. Tens of thousands of union demonstrators blocked roads and snarled traffic in dozens of Brazilian cities on Thursday in a one-day strike aimed at seizing the momentum of huge protests that swept the country last month. Protesters on Thursday demanded more labor rights while echoing the calls last month for greater investment in public health, education and transportation. REUTERS/Sergio Moraes ( BRAZIL-STRIKE/ )

Aerial view of the clashes happening in front of the Municipal Theatre in Rio de Janeiro on July 11, 2013 after a march by Brazilian workers in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. TASSO MARCELO/AFP/Getty Images ( 521293206 )

Masked protesters with a sign that reads in Portuguese "Popular revolt" shout slogans against Rio's Governor Sergio Cabral outside the Guanabara Palace, the governor's office, in Rio de Janeiro, Brazil, Thursday, July 11, 2013. Workers across Brazil walked off their jobs in a nationwide strike demanding better working conditions and improved public services in Latin America's biggest nation. (AP Photo/Felipe Dana) ( Brazil Protests )

A masked demonstrator shoots a firework at police during a strike in Rio de Janeiro, Brazil, Thursday, July 11, 2013. Workers across Brazil walked off their jobs in a nationwide strike demanding better working conditions and improved public services in Latin America's biggest nation. (AP Photo/Nicolas Tanner) ( Brazil Protests )

A protester throws an object at police as others take cover behind a trash bin and signs as they protest outside the Guanabara Palace where the state governor has his office in Rio de Janeiro, Brazil, Thursday, July 11, 2013. Workers across Brazil walked off their jobs in a nationwide strike demanding better working conditions and improved public services in Latin America's biggest nation. (AP Photo/Felipe Dana) ( Brazil Protests )

Riot police officers are deployed after clashes erupted following a march by Brazilian workers in Rio de Janeiro, Brazil on July 11, 2013, in a day of industrial action called by major unions to press demands for better work conditions. Demonstrators on Thursday blocked roads and staged protest rallies across the country on the "National Day of Struggles" which was called by the country's five leading labour federations during last month's mass street protests to demand better public services and an end to endemic corruption. TASSO MARCELO/AFP/Getty Images ( 521294656 )

Demonstrators are detained by riot police during the "National Day of Strikes, Stoppages and Protests" near the Rio de Janeiro Government Palace July 11, 2013. Tens of thousands of union demonstrators blocked roads and snarled traffic in dozens of Brazilian cities on Thursday in a one-day strike aimed at seizing the momentum of huge protests that swept the country last month. Protesters on Thursday demanded more labor rights while echoing the calls last month for greater investment in public health, education and transportation. REUTERS/Ricardo Moraes ( BRAZIL-STRIKE/ )

Demonstrators run inside a tear gas cloud during a clash with riot police during the "National Day of Strikes, Stoppages and Protests" near the Rio de Janeiro Government Palace July 11, 2013. Tens of thousands of union demonstrators blocked roads and snarled traffic in dozens of Brazilian cities on Thursday in a one-day strike aimed at seizing the momentum of huge protests that swept the country last month. Protesters on Thursday demanded more labor rights while echoing the calls last month for greater investment in public health, education and transportation. REUTERS/Ricardo Moraes ( BRAZIL-STRIKE/ )

A riot police stands next to a fire after clashing with demonstrator during the "National Day of Strikes, Stoppages and Protests" in front of Rio de Janeiro Government Guanabara Palace July 11, 2013. Tens of thousands of union demonstrators blocked roads and snarled traffic in dozens of Brazilian cities on Thursday in a one-day strike aimed at seizing the momentum of huge protests that swept the country last month. Protesters on Thursday demanded more labor rights while echoing the calls last month for greater investment in public health, education and transportation. REUTERS/Ricardo Moraes ( BRAZIL-STRIKE/ )