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Migrant workers from Indonesia carry placards which collectively read "Slave" next to a portrait resembling a likeness of former Indonesian maid Erwiana Sulistyaningsih (top L) during a Labour Day rally in Hong Kong on May 1, 2014. Over a thousand protesters gathered for the annual May Day rally in Hong Kong's landmark Victoria Park to walk towards the government headquarters waving colourful flags and placards, while singing a Chinese version of the famous "Do you hear the people sing?" from the musical Les Miserables, calling for better working conditions and better wages. AFP PHOTO / ANTHONY WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

Migrant workers from Indonesia carry placards which collectively read "Slave" next to a portrait resembling a likeness of former Indonesian maid Erwiana Sulistyaningsih (top L) during a Labour Day rally in Hong Kong on May 1, 2014. Over a thousand protesters gathered for the annual May Day rally in Hong Kong's landmark Victoria Park to walk towards the government headquarters waving colourful flags and placards, while singing a Chinese version of the famous "Do you hear the people sing?" from the musical Les Miserables, calling for better working conditions and better wages. AFP PHOTO / ANTHONY WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
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AFP ANTHONY WALLACE

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Erwiana Sulistyaningsih, a former domestic helper from Indonesia, holds a sign that reads "End Slavery Now" during a press conference in Hong Kong on December 22, 2017. A Hong Kong woman jailed for six years for starving and beating Sulistyaningsih was ordered by a court on December 21 to pay more than 100,000 USD in damages for the "inhumane" abuse. / AFP PHOTO / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)

Erwiana Sulistyaningsih, a former domestic helper from Indonesia, holds a sign that reads "End Slavery Now" during a press conference in Hong Kong on December 22, 2017. A Hong Kong woman jailed for six years for starving and beating Sulistyaningsih was ordered by a court on December 21 to pay more than 100,000 USD in damages for the "inhumane" abuse. / AFP PHOTO / Anthony WALLACE (Photo credit should read ANTHONY WALLACE/AFP/Getty Images)
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AFP ANTHONY WALLACE

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Street performance by Abolishion team to raise awareness of human trafficking and sexual slavery, Athens, Greece, Sep 20, 2016. Over 10,000 unaccompanied migrant children have disappeared in Europe, the EU police agency Europol said, fearing many have been whisked into sex trafficking rings or the slave trade. (Photo by Giorgos Georgiou/NurPhoto via Getty Images)

Street performance by Abolishion team to raise awareness of human trafficking and sexual slavery, Athens, Greece, Sep 20, 2016. Over 10,000 unaccompanied migrant children have disappeared in Europe, the EU police agency Europol said, fearing many have been whisked into sex trafficking rings or the slave trade. (Photo by Giorgos Georgiou/NurPhoto via Getty Images)
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Protestors supporting former "comfort women", who served as sex slaves for Japanese soldiers during World War II, hold banners reading "Disband the Tokyo-funded Reconciliation and Healing Foundation! Give back one billion yen!" during a weekly anti-Japan rally near the Japanese embassy in Seoul on January 10, 2018. South Korean President Moon Jae-In on January 10, called for a "heartfelt apology" from Japan to the victims of wartime sex slavery, condemning a 2015 agreement as a "wrongful" solution. / AFP PHOTO / JUNG Yeon-Je (Photo credit should read JUNG YEON-JE/AFP/Getty Images)

Protestors supporting former "comfort women", who served as sex slaves for Japanese soldiers during World War II, hold banners reading "Disband the Tokyo-funded Reconciliation and Healing Foundation! Give back one billion yen!" during a weekly anti-Japan rally near the Japanese embassy in Seoul on January 10, 2018. South Korean President Moon Jae-In on January 10, called for a "heartfelt apology" from Japan to the victims of wartime sex slavery, condemning a 2015 agreement as a "wrongful" solution. / AFP PHOTO / JUNG Yeon-Je (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
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AFP JUNG YEON-JE

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South Korean policemen (L) stand guard near a statue (R) of a teenage girl in traditional costume called the "peace monument" for former "comfort women" who served as sex slaves for Japanese soldiers during World War II, in front of the Japanese embassy in Seoul on December 29, 2015. South Korean officials met with former "comfort women" to seek their support for a landmark deal with Japan, after criticism it does not properly atone for the treatment of women forced into WWII army brothels. AFP PHOTO / JUNG YEON-JE / AFP PHOTO / JUNG Yeon-Je (Photo credit should read JUNG YEON-JE/AFP/Getty Images)

South Korean policemen (L) stand guard near a statue (R) of a teenage girl in traditional costume called the "peace monument" for former "comfort women" who served as sex slaves for Japanese soldiers during World War II, in front of the Japanese embassy in Seoul on December 29, 2015. South Korean officials met with former "comfort women" to seek their support for a landmark deal with Japan, after criticism it does not properly atone for the treatment of women forced into WWII army brothels. AFP PHOTO / JUNG YEON-JE / AFP PHOTO / JUNG Yeon-Je (Photo credit should read JUNG YEON-JE/AFP/Getty Images)
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AFP JUNG YEON-JE