A man wearing a World War II guerrilla cap with the communist five-point star salutes, during a May Day rally on International Workers Day in central Belgrade, Serbia, Sunday, May 1, 2016.
Communist Party supporters hold a flag depicting Soviet leader Joseph Stalin as they attend a rally to mark May Day in St.Petersburg, Russia, Sunday, May 1, 2016.
Members of All Pakistan Trade Union Federation chant slogans during a rally to observe Labor Day in Lahore, Pakistan, Sunday, May 1, 2016.
Supporters of the Lebanese Communist party chant slogans against the Lebanese government during a demonstration to mark Labor Day in Beirut, Lebanon, Sunday, May 1, 2016.
Activists of the Sri Lankan Marxist political party Peoples' Liberation Front mark May Day in Colombo, Sri Lanka, on Sunday, May 1, 2016.
Hundreds of protesters, mostly workers, march with pink umbrellas towards the Presidential Palace to mark the International Labor Day Sunday, May 1, 2016 in Manila, Philippines.Philippines.
Riot police detain a man during May Day demonstrations, in Istanbul, Sunday, May 1, 2016. Security forces prevented leftist groups trying to reach city's iconic Taksim Square to celebrate May Day.
Pakistani labourers shout slogans and wave placards as they march behind banners at a rally in Quetta on May 1, 2016, on International Labour Day or May Day.