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A French CRS anti-riot police officer fires a tear gas canister towards protesters during a march for the annual May Day workers' rally in Paris on May 1, 2017. / AFP PHOTO / Zakaria ABDELKAFI (Photo credit should read ZAKARIA ABDELKAFI/AFP/Getty Images)

A French CRS anti-riot police officer fires a tear gas canister towards protesters during a march for the annual May Day workers' rally in Paris on May 1, 2017. / AFP PHOTO / Zakaria ABDELKAFI        (Photo credit should read ZAKARIA ABDELKAFI/AFP/Getty Images)