Members of the Federation of Korean Trade Unions shout slogans during a May Day rally near the National Assembly in Seoul, South Korea, Friday, May 1, 2015. BERLIN — Left-wing groups and trade unions were staging rallies around the world Friday to mark International Workers Day. Most events were peaceful protests for workers' rights and
May Day Protests Staged Around The World; Turkey Square Blocked
International Workers Day originates in the United States. American unions first called for the introduction of an eight-hour working day in the second half of the 19th century.