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A man holds up smoke flares, as people attend the traditional May Day labour union march in Paris, France. REUTERS/Gonzalo Fuentes
A person wears a clown nose as people march to celebrate May Day, in Kadikoy, Istanbul, Turkey. REUTERS/Dilara Senkaya
Plain-clothed police members detain a protester, as people attempt to defy a ban and march on Taksim Square to celebrate May Day in Istanbul, Turkey. REUTERS/Umit Bektas
Anti-government protesters attend a rally for May Day in Belgrade, Serbia. REUTERS/Zorana Jevtic
A child runs beneath the peace flag during a May Day demonstration organized by confederate trade unions in Rome, Italy. REUTERS/Yara Nardi
People march to celebrate May Day, in Kadikoy, Istanbul, Turkey. REUTERS/Dilara Senkaya
Protesters clash with the police during a Labor Day demonstration in Manila, Philippines. REUTERS/Noel Celis
A woman waves a red cloth from the window during a May Day demonstration organized by confederate trade unions in Rome, Italy. REUTERS/Yara Nardi
Labourers wear Joker masks as they attend a protest during a May Day rally in Jakarta, Indonesia. REUTERS/Ajeng Dinar Ulfiana
People carry banners as they march to celebrate May Day, in Kadikoy, Istanbul, Turkey. REUTERS/Dilara Senkaya
Several workers from the Korean Confederation of Trade Unions (KCTU) attend a May Day rally in Seoul, South Korea. REUTERS/Kim Hong-Ji
Policemen stand in formation during a Labor Day demonstration in Manila, Philippines. REUTERS/Noel Celis
Senegalese workers stand around a coffin that they say symbolizes fired workers in Dakar, Senegal. REUTERS/Zohra Bensemra
Bangladeshi workers chant slogans as they participate in a rally to celebrate May Day, in Dhaka, Bangladesh. REUTERS/Mohammad Ponir Hossain
Labourers attend a protest during a May Day rally in Jakarta, Indonesia. REUTERS/Ajeng Dinar Ulfiana
Several workers from the Korean Confederation of Trade Unions (KCTU) attend a May Day rally in Seoul, South Korea. REUTERS/Kim Hong-Ji
Plain-clothed police members detain a protester, as people attempt to defy a ban and march on Taksim Square to celebrate May Day in Istanbul, Turkey. REUTERS/Umit Bektas
Several workers from the Korean Confederation of Trade Unions (KCTU) attend a May Day rally in Seoul, South Korea. REUTERS/Kim Hong-Ji
A detained protester shouts slogans from inside a bus, as people attempt to defy a ban and march on Taksim Square to celebrate May Day, in Istanbul, Turkey. REUTERS/Murad Sezer
Protesters attempt to defy a ban and march on Taksim Square to celebrate May Day in Istanbul, Turkey. REUTERS/Umit Bektas
A person wears a uniform of the former Soviet "Red Army" as people march to celebrate May Day, in Kadikoy, Istanbul, Turkey. REUTERS/Dilara Senkaya
Social Democrats celebrate May Day in Vienna, Austria. REUTERS/Lisa-Maria Leutner
Members of the police stand guard, on the day people attempt to defy a ban and march on Taksim Square to celebrate May Day, in Istanbul, Turkey. REUTERS/Murad Sezer
Protesters take part in a rally commemorating May Day, in Athens, Greece. REUTERS/Louiza Vradi
Protesters clash with the police during a Labor Day demonstration in Manila, Philippines. REUTERS/Noel Celis