ISTANBUL — Members of Turkey's major unions gathered in Istanbul's Taksim district to pay their respects to the victims of the 1977 massacre. Unidentified gunmen fired on a 500,000-strong peaceful crowd on May 1, 1977 as people gathered at the site to celebrate Labor Day. Three dozen members of unions including the Confederation of Revolutionary Trade Unions (DİSK) and the Confederation of Public Sector Trade Unions (KESK) placed flowers on a street near the square on Monday. Thirty-six people died in the riots and fighting that followed.